I read all the replies you've gotten OP and I gotta say... this is a situation where I don't feel like you can just take the words she said, read them on the screen, and be sure there's nothing there.
When young kids (and older ones too) say something that kinda raises a flag for me, I simply ask them what they mean, or if they're younger, I ask what that looks like. "My daddy is a good lover" to me IS an odd thing to say, but just a few more questions like "What does that mean? What does a good lover do?" to understand more where she's coming from. If her answers are clearly in a "he loves our dog, and he loves my little brother, and he loves to eat french fries", then it's probably nothing to get more worried about. But there ARE answers that a child that age can give that are concerning.
Does that mean, automatically, if she says something else that's scary, that she's being abused? Not at all. As many have said, it could be she's seen her parents do things or parroting them, or she's seen it on t.v..
But as a parent trying to assess your comfort with your child hanging out with this child, I absolutely say "Go with your gut". Since that specific moment and comment has already passed, I'd continue to only let her come over to your house, and listen and supervise. If nothing else weird comes up, fine. If she says something else that raises your concern, ask her about it in a non-leading way (i.e. open questions like "What does that mean? What does that look like?" and not "Does your dad touch you??" or anything that direct, unless she says something really really crazy and scary).
Also keep doing what you're doing, watch your own dd's words and actions and make sure you address anything that seems not-aligned to how you want to raise her. Some things we don't have much control over, but you can absolutely bet that if my child started saying things about her looks or her body that troubled me, or I heard her friend say something that creeped me out because they were words or a phrase I don't expect a child that age to say, I'm gonna follow up on it. Not in an alarmist way (even if I'm internally a little alarmed), but in a matter of fact way. I've already had to do that a couple of times with my dd and she didn't seem phased by my questions, and I felt reassured that it was nothing.
By the way, I DO understand that kids say things all the time that are misrepresentations of the words. My dd the other day was at a friends house then came home saying she was wearing "flip flops" and she kept showing me her face. I asked many questions to try to understand what "flip flops" meant to her, since it clearly wasn't footwear, and finally figured out she meant "lip gloss" (which I had a different issue with, but at least I understood her!) So I do get that the neighbor girl most likely didn't mean what that word means to adults. But I'd want to check. So if there's a next "Whoa, that is weird" comment from her, ask her what she means or how she knows, you know, kid-level questions to try to sort out what she's expressing. I really think that will further direct you to what you think you should or shouldn't address and how to do it.