Okay my lil cousin is 14 and she is having sex and now her blatter is weak what is wrong with her?

Help me!Okay my lil cousin is 14 and she is having sex and now her blatter is weak what is wrong with her?
when you say "her blatter is weak" I'm assuming you mean her bladder is weak which means she has urinary incontinence. This may be a sign that her urethral sphincter might have been injured during one of her sexual activities. Which is one of the reasons why 14 year olds should not engage in sex.
Please bring her to a qualified gynecologist.
Maybe she is pregnant. She should see a doctor soon!!