Quiet, Im a bit "meh" on the looks of the mini tuff lite. I know what she prefers in terms on looks, and that definitely isnt it. Im thinking something more "straight" looking as far as overall design, and with a more traditional looking blade shape (traditional is probably a bad word to use in this case). You know, more like a standard drop point or clip point, etc. As far as the overall knife, Im thinking something elegant, thin, and classier might be ideal, considering the situations she will be using it in. But by all means, throw all of your suggestions into the pile. It definitely couldnt hurt!
For under $200, here is my suggestion. First and foremost, remember that your sister does not carry anything in her pockets regularly. There are many times when she does not HAVE any pockets, so it will live in her purse. If she doesn't have her purse, she's not going to have your knife. You want to cover your bases here. Something for the purse, something for the dorm, and something that will go on her keychain. They all have to be cute or they're not going to be used.
1. For the dorm/her room -- a pair of Ontario scissors with the leather sheath.
2. For her keychain -- SAK Classic Edelweiss. Otherwise go with something pink. Or get the animal prints one in Tiger. There's one in Watermelon that has a fingernail clipper.
3. For the purse -- Opinel #6 in stainless
Scissors -- $35
SAK -- $20
Opinel #6 -- $15 give or take
Bonus Pack
Fenix E12 mini flashlight, AA. Give her a huge pack of Duracells or a charger if she will remember to charge it up, $30 plus batteries
Thermos Stainless Steel Commuter Bottle, 16-Ounce, Raspberry, $30, will fit in car cup holders
Rainbow space pen with two refills, $40 with the refills give or take
Pyrex one quart measuring cup. Good for nuking Ramen. $7
Aerobie Superdisc. $8
Cute pink flash drive -- $20 give or take
Lipton tea, 300 bags -- $7
All of the above is in the $200 range. Your sister may be very different from the college freshmen girls I know, so if any of this has some value to you then great.