I'd say Meulin definitely would be lust. She's very open about her desires and fascinated to learn that of others and her thoughts essentially boil down to "if it's consensual and no feelings are being hurt who cares"? It's definitely the vice she would have and the one she'd most question why is this considered a sin. She's an incredibly
physically affectionate person--maybe a bit too much at times and she needs to remember to ask first before she goes hugging people but yea. She's probably a lot kinkier than her cheery and bubbly disposition might make people think. She'd try a lot of things out.
I'd say she'd also be envious of the lives some other people have in general, though not any one specific thing. But anyone who can be with their family or has a stable life and a healthy relationship with their SO she'd definitely be a little saddened by and wish she could have the same.
Also, naughty kitty~:33