Daughter bites nails very short and bites skin

Hi There,
My daughter bites her nails and has now started biting the skin on her hands and fingers. She recently stopped biting her toenails after getting an ingrown toe nail. She usually bites her nails and fingers when watching TV, in the car, playing sports.
About her:
9 years old, she is a very easy kid, she is a "people pleaser". She likes to agrees with what her friends and others say (like: I like that too, i know i have been there, i am hot also, i am hungry too, me too) even if it isn't true. she doesn't mean harm by it though. She is very competitive and doesn't like to lose. She was a thumbsucker until age 6. She was a very easy baby. She has had worms over the past couple years off and on. Please let me know if you need any more information. Thank-you kindly.