Why won't she let me meet her parents?

ive been dating this girl for almost 2 months and I've only met her mom and sister once for like 5 mins. we live 20 min apart and she is always coming over to my place. She just graduated and is living with her parents and I think she is embarrased of them but when I met them they seemed fine to me. I have yet to hang out there and its starting to get annoying because it limits our time together. Is it weird that she is doing this? or is it just me?
Why won't she let me meet her parents?
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