Ex Girlfriend friend request on Facebook

First i want to make clear that i want my ex girlfriend back.

im asking for help as to how i should go about doing this to increase my chances of getting her back, please do not get into a debate of whether i should or not, i want her back.

every relationship has its ups and down, but this was the point she elected to pick a fight about.

the sequence is this:

when we first started going out, she sent me a friend request on facebook. At this point i dont even use facebook, i left it alone as "awaiting confirmation"

About 3 weeks ago,
My girlfriend said she wanted space, because she thought i didnt add her on facebook & i was hiding her from people, but in reality i truly didnt use facebook and she retracted her friend request.

I got on facebook, sent her a friend request to show that i was telling the truth and my profile is basically blank, but she declined & ignored the request within a few days.

we have been on no contact for about 3 weeks, except one short call to see how you are doing.

Yesterday she sent me a friend request to add me,
i am unsure if she did that because she interested again or just wants to be friends.
What does this mean? How should i go about doing it?

thanks

wow that is wierd. how old are you guys cause thats really childish of her.