Backstabbed by my best friend...advice?

so my friend backstabbed me in a huge way, but I forgave her. Over the course that we werent friends she changed as a person. Now she has new friends which is fine but i kinda feel replaced. she makes a lot of fake excuses of why she cant call me or she doesnt invite me places which is weird when now we are suppose to be friends again. i miss the old her. ive talked to her about it once and she says she does want to be my friend. i cant stand how i am being such a good friend to her and she is being such a horrible one. i feel like a suck up! like i am begging her to be my friend again when honestly i kinda feel it should be the other way around after what she has done to me. im tired of been walked over but not sure if i am strong enough to stand up for myself in fear of losing her again. my question is what should i do? advice please?a bit added info...a lot of my close other friends i had before i met her are actually lost now because they didnt like her so if i lose her then i have nobody including family. which now it really sounds like i should ditch her but i just cant. i love her. i think she is just going through a phase. i know i sound desperate but i really am trying to give her space. i cant leave her though. i need advice on how to reach her...tap in the old person. im considering reading her the comment responses to my question on here to her.

you can make new friends, it sucks that you are losing one, but a real friend worth having would not be treating you like s**t, so try and hold your head up and find new friends that love you for you