My girlfriend started doing her nails after one month together?

My current girlfriend (friends for over a year), we started dating like one month and a half now. I recently noticed she started doing her nails, a thing which she never did and cut her nails everytime for the last year and so. She is kinda in the masculine when she’s talking to friends in common or her job, but I know damn well I ground her into her feminine when we’re together… What does her doing her nails again mean if any?
My girlfriend started doing her nails after one month together?
Post Opinion