She says shes tried doing it on her own and it never works for her im really confused and i dont want to ask her to consult a professional since she might take it the wrong way and get offended

Hi im 15 and me and my girlfriend have decided to take things further i tried fingering her over her clothes once and she seemed to like it a bit but another time i tried to do it properly and she said she didnt really feel it then after a bit it hurt or felt uncomfortable then we tried another time...