Welcome to the forum!
The dreaded ‘friend zone’, huh? People have posted advice on similar situations in the discussion forum. Check this thread out: Help turning a long time thread into a lover
Just search ‘friend’ in the Advice forum and you’ll find tons of threads about the same thing.
I would suggest something like IS and Ammo to start with. It will take time as you will have to gradually change her feeling towards you but it can happen and those pheromones should help. Ammo will give you a subtle sexual vibe which can have great results and IS will make both of you feel good and could make her perceive you as more attractive.
In order to qualify for the $25 GC, tell us a little more about your personality. Also, how did you find out about pheromones and is there anything else you hope to accomplish with them other than attracting your friend?
Good luck.