I got a new girl friend 4 weeks ago and she told me she was a virgin but last time when i was with her i still

I got a new girl friend 4 weeks ago and she told me she was a virgin but last time when i was with her i can put my index whole finger in her so i wasnt sure if she was a virgin or she is lying to me and she sad to me it is so painfull and there was no blood. but i can feel it was tight and i didnt feel like i was breaking thru anything when the finger went thru. is she really a virgin????