I know someone who is just like that. An irresponsible financial mess, has 2 kids that don't live with her, low intelligence, grew up dirt poor without a father figure, is openly disrespectful to her significant others in public, loves drama, has tried to commit suicide, breaks everyone's confidence, is into tons of kinky ****, etc, etc, etc...
She came on to me really strong, smacking my arm, making plans to hang out, talking about how she masturbates multiple times a day... she was trying to get me to bang her after she dumped her ex (whom I know). I wasn't having any of it, even though we click unbelievably well when we have a conversation. But it's a trick. she's not intelligent, but she's a master manipulator.
These people aren't crazy, they're grifters/parasites who mooch off others because they're too dumb to make a living themselves and have figured out they can manipulate others to foot the bill for them.
Pretend she has Ebola and never talk to her again, If you stick around, she'll eventually find a way to ruin your life.