They say a vagina doesn't get loose, but really?...?

I have been seeing this girl, she said she had been abstinent for 6 months. When we first got together my penis slid in with little resistance. She was very lubricated, but still there was no tightness/hugging of my penis. I am decent size 7x5.5. She's also very petite asian islander 5'2, 110lbs. She said I'm bigger than her ex but I dont believe her, especially since she started talking about him and his new gf the next day after we had sex the first time. She has a high sex drive and went wild when unbeknownst to her I worked a couple fingers into the vagina while pumping her with my penis. My question is: Was her vagina loose and relax from accommodating large penis before? It must be disappointing to not be filled like you're used to... Thanks for your HONEST carnal thoughts.