A lot of people are giving you great advice.

Lindsay could be my cousin Megan.

Megan needs attention and validation all the time. We know she has some sort of medical issue, but what? We don't know, because we don't believe anything she says. She lies about having bad things happen to her, to the point where she actually broke her leg and I thought she was lying.

I have had to talk to her about limiting the amount of lies she tells, because if she lies to everyone then she will die in a ditch and no one will think she is doing more than watching Netflix.

I don't trust her. But I have accepted that to keep her in my life I have to either treat her like everything she says is real or a lie.

We handle her by doing three things:

1. Limiting the amount of time we do things with her.
2. Meeting at her house to pick her up instead of having her meet us.
3. Inviting her to group outtings instead of one-on-one. It is not a lot of trouble to have Megan come out to dinner with the cousins, because she can either 'be attacked by wildebeests' and not come, or show up then leave at her own preference.

We never invite her to anything that needs a definite number of people. She is not invited on vacations, to nicer dinners, or to weddings. She has a lot of FB/twitter followers and feels safer on the internet.

It sounds like your friend wants the attention and concern. She is using emotional manipulation to sooth her fluctuating moods.

So if you are not into having this sort of person in your life, move on. But do call her mom, do call her out on it, and do explain why you are ending the friendship. There is nothing wrong with saying, "I can't handle mental illness. I have a baby, I have my own life, and she won't change."