Okay, since I don't know what you budget is, I am going to suggest a couple different things.
1- A gift certificate to a spa for manicure, pedicure, etc.
2- Since she likes movies, whatabout doing a themed basket up. A gift certificate to where she rents movies, popcorn, peanuts, pop, etc.
3- If there is something else that she really likes, do a theme basket around that. I once did one around ice cream sundaes
4- I think something that I would do, would be set a date that you and her go out. Don't tell her, where you are going to take her. Have reservations somewhere and hopefully the rest of your gang will be there.
5- Also you could do a balloon bouquet instead of flowers.
6- Take her somewhere the two of you can be like kids, amusement park, etc.
7- This one requires the whole gang. What about everyone writing a letter to let your friend know how they valueable the friendship, and what she means to them in their life. I would put all these letters together in an album.
To me, it sounds like she doesn't have a lot to look forward to. Hopefully I have given you some ideas that will work for you budget.
Have Fun
K.