B.C.
She's growing new hair.
All babies lose the hair they are born with and it falls out as new hair grows in.
It's nothing to worry about.
Please talk to your pediatrician about your concerns.
Many have help lines where you can call a nurse 24 hours a day because they know new parents have worries and need help.
3 months olds get bored and they will grab anything - ears, nose, hair, etc.
Try giving her something to hold onto - a binky, a teething ring, a rattle.
If she's scratching herself badly - wait till she's sleeping and make sure her nails are trimmed so she can't do that.
If worse comes to worse you can put mittens on her.