You won't ever get over it but in time the pain & hurt kinda fades away.  

I have had such a passion for dogs that I started taking in dogs without homes.  I only took in the large & larger dogs cause most shelters are set up for the smaller dogs.  I kept 5 at a time for many many yrs, well until I got too old to care for such creatures.  I loved each & every one of them & it always hurt like hell when I lost one.  Now I had room to take in another dog that needed it's last forever home.

Maybe it is time to look around & see if there is a dog that just takes your heart away & you can save its life & give it a forever home.  It is not too soon & you wouldn't be replaces your old friend, you would be just getting another friend.  Are you in a place where you could have a pet?  You remember the everlasting love & devotion of your old friend, you can feel that again with another dog but you will never ever forget about your first love.

I feel sorry for your loss.  I've gone through four dogs who died naturally.  I'm on my fifth one, Boots, who's 15 yo which puts her at about 80 yo in people terms...same age as I.  I dread the day when I must put Boots down.

But unlike you, I had all four dogs cremated and inurned.  So I have four little decorated urns each with the dog's ashes.  The urns are on a shelf where I can see them and reminisce now and then about them.  And that's what you are missing, the reminders of your best friend when you were younger.

I of course have no clue about that dog cemetery.  But I have to believe they keep some sort of records of what dog is buried where in the cemetery...even if there is no tombstone or similar.  Call that cemetery and ask them.  If they do have a record you can visit the cemetery and go to where your best friend is buried.  Maybe that will give you some closure.

Good luck.

I'd suggest therapy.  Ask your mother where she's buried.  Someone knows.  What does "my agreed with the vet" mean?  You agreed to bury her?

Again, until you are living ON YOUR OWN and supporting yourself, another dog is NOT a good idea.

Get another dog, that is best way to heal, most will be just as affectionate and friendly as the last one. You gave your dog an incredible life and that is what you should dwell on not the fact that you missed the death - there is no spirit at the grave it really doesn't matter in the grand scheme of things but what would matter would be owning and loving a rescue dog and becoming the leader of that dogs pack....

1. See if you can locate the cemetery (if there is one) and inquire further. If this was a legitimate pet cemetery, they are required by law to log where the pets are buried. Perhaps, it is rather a private piece of property in which case that would not be the case. Normally, a pet burial is more costly than cremation. Either way, you could still go to the general area to place flowers, etc.

2. Make a memory album. Put nice pictures and thoughts about your dog in that album. 

3. Take something valued or part of the pet and place in a box and bury it for her memory. Make a garden stone with her name on it, and decorated nicely. Plant flowers there

4. Look online under "pet memorial" and you will find loads of stones, markers, etc to help with her memory.

5. Adopt another pet. Don't feel your dog was the only one who can bond with you. There is another pet out there who might need you and with your great home, will be happy rather than a sad animal with no one to care for it. Look on www.petfinder.com which is where rescue leagues and shelters advertise their animals. DO NOT be sucked into Craigslist ads where there are tons of scams. Please be careful in this manner because they are taking people's money but no pet is available.

6. Join a group or activity that centers on a skill or talent you have. That might be dance, marital arts, travel, language, helping others, etc. In doing this you will begin to value things about you.

7. Take some college classes that will help you develop a good career. Look this up: Top jobs 2020. Ask the advisor how many people are employed once they graduate.

8. Get together with friends. Enough cannot be said about the help of those who care.

9. Volunteer somewhere and help others. 

10. Have some fun doing fun things.

11. Thank your dog for being a good pet and support, and bless her for being in a good place. She has done her job, and now you can move to other things that will celebrate who and what she was.

12. Be proud of you!! And show her she did good for you.

I had a dog like that. She was very perceptive, cheerful, fun, pretty, and loving. Make her memory worth something by doing the things above.