My Best Friend Always Talks Trash Behind My Back!!?

We have been best friends since 4th grade. She had no friends, and i felt bad and invited her to hang out with me and my friends. Well now were in 8th grade. And i started becoming friends with a new group. Me and a few girls got REALLY close, and were like bff's now. Shes not really friends with any of... show more We have been best friends since 4th grade.
She had no friends, and i felt bad and invited her to hang out with me and my friends.

Well now were in 8th grade.
And i started becoming friends with a new group.
Me and a few girls got REALLY close, and were like bff's now.
Shes not really friends with any of them.
But just hangs out with them, bc im there.

So recently i was talking to Bridget and she told me that stephanie ALWAYS talks trash behind my back.
Ex: " dayna's such a *****, and she says that your ugly and annoying "
She told birdget that.^
Bridgets MY BEST FRIEND, I WOULD NEVERRR do that.
And B told me that she talks **** on me to everyone.
Not only me, BUT other girls in out group.

I tried talking to her about it, but she said she was just pmsing and felt left out bc all the girls like me, and not her.
That was 2 months ago.
And she IS STILL talking trash.

I've been her friend for like 4 years now, and dont want to waste all the memories we have had togther.
But shes ovbiously not a true friend if she is two-faced to everyone.
The girls in my group just want to ingnore her.
And see what happens?
Is that a good idea?
Im just so fed up with all the drama shes creating.
And help would be great(:
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