Would you be offended? Is this rude?

So my sister got pregnant the same time I did, but I didn't know, because I absolutely do not get along with her, never have, we have no contact, and she moved away from town. So I tell my parents I'm pregnant, and one of the first things they say is "oh, so we are getting a grand baby after al!"

Confused I ask what my mother means, and she goes on to tell me that a day or two before my sister had called, and said that she had miscarried (my family knew about the pregnancy, but I didn't, because again we do not speak). I let it go, even though I find it odd timing to bring it up, but say to my mom "despite not liking her, I'm sorry to hear that, and hope she feels okay about it some day". And move on.

So time goes by, and at least every other time me and my mom speak my mom brings it up that my sister had miscarried. Again I try to let it go, because my mother had miscarried a few times and so I chalked it up to my mother feeling overly bad for my sister and not realizing it was annoying/disheartening to hear about it when speaking about my baby.

Flash forward to yesterday, when I tell my mom it's a girl, she's of course excited, and we shop for baby clothes, and it's all fun until she sees something with giraffes (my sisters favorite animal) and says "I can't stop thinking about (your sisters) baby, and how she miscarried," after pointing out a onesie and mentioning it has giraffes. Again, I try to let it go, even though I feel it is putting an unnecessary damper on things.

Now that all bugs me, but I'm trying desperately to let it go, but then I felt the boundaries were pushed when we go outside of the store and begin to talk. She says she excited, and that she should have known it was a girl, because "all that happening on your face" (referring to the three pimples I have). I'm kind of agitated by the comment, but whatever, it's true I have zits now from hormones. I say "it's just hormones", and then she continues to say "that probably means she's going to look just like your sister- cause she has zits, so the baby will probably have them and look just like her".

I find this very rude, because

a) she knows I dislike my sister, yet she says my baby will look like her and laughs about it. (She's done this before, saying if the baby is a boy he'll probably look like my abusive father and laughing).

b) I tell her I saw the baby's face for a moment on the ultrasound (couldn't get a good picture, because she was hiding), and she very much looks like myself and a little like my spouse. Yet she still insists it's going to look like my sister.

Am I wrong for finding these comments rude? Is my mother projecting her sadness over my sisters loss? Should I say something if this sort of thing happens again? Is she the one being insensitive to the fact that I'm my own person and this is my baby? Do you think she'll bring it up to the baby one day? Or say my baby looks like my sister, even if she doesn't?