Is this girl inappropriate or just plain bitter?

I have a female acquaintence who has been acting very quietly resentful towards young parents these days. Whenever she finds out that someone unfriendly to her is pregnant or having a kid soon(which is occuring quite often lately, weird as it is), she mutters under her breath "why are people ok with that jerk having a kid, but they told me to get an abortion when I had a 'scare' a yr ago?" She's hated celebrity Nicole Richie for a long time & when the world found out Nicole Richie was pregnant this summer, this girl hit the roof. "How can that anorexic druggie Nicole deserve a baby, but people told me to get an abortion? How can people say they're happy for her, but nobody supported me?" is what she says. It's getting a bit redundant & annoying. Whenever we made remarks to her like "I can never imagine you raising a kid," she gets mad(but does a fairly good job hiding her anger). Is this normal behavior? Why is she acting like this?

I noticed that if it's one of her friends having a kid or someone she's cool with, she's fine with it.

She only seems to resent the people with kids that excluded her from their social circle or disrespected her in the past. She also resents how hated celebs like Nicole Richie or K-fed have kids. She also tends to resent people that are her age or younger, unmarried, and have less going for them than she does...she keeps saying "why did people tell me that I would be insensible not to get an abortion, yet everyone congratulates that witch, who's been rude to me since 12th grade?"

Ideas? Is this abnormal? Any diagnoses?

this is normal, to a point.
clearly when she had her scare, she felt abandoned and uncared for. no woman wants to be told that she should have an abortion because she wouldn't be a good mother. even a woman who doesn't necessarily want children would be upset by that. a big part of her lashing out has to do with how she was treated, herself. there's nothing to be done to un-do what happened. it's obvious, though, that people need to be sensitive to the fact that she is easily hurt by remarks about her apparently missing motherhood skills. doesn't matter if it bothers you or annoys you, it's hurting her and it's only making things worse for that social relationship.
another question would be about her own history with her mother. i am inclined to believe she's coming by this intensity honestly, although it's possible that she's clinging to her scare as a way to set herself apart and make herself special. but if she had a tempestuous relationship with her mom, or if her mother had had an abortion, or was going to abort her, that would explain a whole different level of this complex situation.

It's quite obvious that she's bitter about what happen. There's really nothing that anyone can do.

If she has a problem with someone getting pregnant or having a baby, that's just it, HER problem. It's okay to be upset about her "scare" but to be bitter about someone else's pregnancy is just plain pointless.

She's resentful about the way she was treated when she was pregnant so now she is lashing out at people in a similar situation who are being supported. Did she actually have the abortion cuz that would explain a lot?

I think her behavior is perfectly normal, unfortunate, but normal. These are people who have been cruel to her, and she is sinking to their level and being cruel back. She should rise above them, but that is easier said than done.

She is bitter. She realizes that there are many flaws within herself, but has not matured enough yet to realize that the power to change is within her, not with how others treat her. She needs to effect the change to make the way she is treated change, not the other way around.