Parents of teens: Is this typical? 17yo extremely jealous (and hostile to me), re: 1yo

I've been trying to be patient because I love my husband's younger cousin, but she's being particularly obnoxious this trip and I'm trying to figure out how "typical" this is. Basically, am I reasonable to expect her to suck it up and be a little more mature, or is this par for the course?My husband's family visited for our daughter's first birthday. Immediately, my husband's 17yo cousin, normally a sweet, helpful young lady, was sour and pissy. Okay, fine, she's a teen, she probably misses her friends and boyfriend. It's a four day trip in the middle of her summer.But I notice then that her animosity is directed toward my daughter. She ignores her (this we expected), but then loudly complains that she's "exhausting" and "ruining everyone's fun." She tells my husband, "Ew, I didn't come to visit her (daughter), I came to see you. She's boring and no one cares about anything she does." (For the record, my 12mo is definitely an active little one, but she's cheerful and calm. 17yo has had zero responsibility over her and has been free to ignore her.)My husband and I tried to carve out some one-on-one time with her, but she kept saying that she doesn't want "[Daughter's] sloppy seconds." Oooookay.Then during the one full conversation she deigned to have with me, she said she never wants to be pregnant because "I'd never want to be so fat a whole year later, like, well, you know" and raised her eyebrows at my stomach. I told that was a hurtful thing to say and she just rolled her eyes and walked away. And I swear she's been whispering "fatty" and laughing each time I've walked by, though I know she'd deny it.She sulked during the party and then randomly made a weird toast about how she won't be able to "be there" for our daughter in the future because her life is going "in a different direction." And then ever since, she's been holed up in the hotel room, refusing to come over to our place. When she does, she's more or less monosyllabic and frankly I'm fine with that.The last time I saw her was less than 6 months ago. Everything was fine then and our relationship was great. This is a total shock. No one else seems to be batting an eye and even my husband shrugs and says, "She's a teen." I feel like she's being over the top disrespectful and it's so uncharacteristic that it should be dealt with. Honestly, I don't want her in my home anymore but I also don't want to be rash or lacking compassion.What do other parents think? I always say I know nothing about kids even a day older than my daughter, so teenage stuff is way above my pay grade. via /r/Parenting https://ift.tt/2lPR9SX