Maybe she's depressed or is going through a lot of stress for some reason. She probably feels overwhelmed. Just talk to her and ask what's wrong, but don't call her oversensitive or assume PMS or something, she could be legit depressed.
She may just be very sensitive. Consider this a blessing. If you need sympathy, she will most likely be there for you.
I wouldn't be able to be around her.
take her to comedies.