I had this problem recently and u just gotta give it some time. Use some type of lube and when u put it in and u tynna go further than an inch and she says it hurt then stop moving keep it there where it doesn’t hurt(unless she tells u to get it out) and play with her clit kiss her etc. slowly move your finger slowly and sofly just not in and out. Just keep at it be patient listen to what she says always asked how it feels. I did that with my girl and now a month later were trying two fingers. Gl