Is she young as well? Maybe as others here are suggesting she hasn’t seen many dicks before, or those that were flaccid. Next time you’re with her you should bring it up since it bothered you, and ask her to clarify. If it is the first time she has seen one flaccid, acknowledge most dudes don’t walk around fully erect (well, maybe not intentionally), or at least the same size as as when erect. Explain to her the whole shower vs. grower thingy. This will clarify her comment. If she shares that she’s yeah, she’s been around and has had her share of big cocks, then ask her why she isn’t with one of them now? Presumably the dick size wasn’t the end all, be all. Maybe they didn’t know how to use their big dicks; or didn’t have two brain cells to rub together; or didn’t treat her right. If still not satisfied after that, dump her rude ass and move on. Plenty of chicks out there who are looking for a good guy who will give them love and attention.