There could be one or many reasons for her behaviour but as you've been good friends, her behaviour seems strange.

Perhaps she feels your friendship has run its course, for whatever reason. It may be good to leave the lines of communication open for a while. I mean for her to check in. If she doesn't, then you'll know the friendship is over. Unless, you would prefer the finality of blocking her on social media, etc now and moving on.

It's one of life's mysteries why good friends suddenly become fair weather friends.