I'm sorry -- I can't imagine having to make such a decision.
I also am in college and I know, for me, giving up Jackson is not an option but I am very lucky that I have
so many family members who love him and would be willing to give me money if anything ever were to arise. I also always keep emergency funds set aside for him... but LP surgery is very expensive! It'd be difficult for me if that were to happen to afford it on my own so I feel your pain. I understand she definitely needs the surgery, but is there any way you could wait a few months, and possibly save up extra money (selling things on eBay, doing side jobs, etc) and then get the surgery, and for now just keep her on supplements (maybe some Cosequin, and pain meds, etc). I don't know much about LP but I've read some dogs can live with it forever w/o surgery, but it sounds like your Lola is in pain. I'm sorry I don't really know what to say but wanted to send my love and support.