I don't want to diet, but I also want to lose some weight?

So I'm 15 female, 130lb. I don't want to diet because I know food is really important in this time of life because of growing, etc. Obviously I can highly decrease the amount of junk food I eat but I don't want to eat less than I usually do (of normal food).

Back in March, I weighed about 118lb. I used to run about 3-4 times a week and also some moderate exercise. I injured my knee and haven't really been active since, and have obviously gained some weight. Almost all my pants and skirts are tight now with the sides of my thighs especially bigger. My stomach isn't really flat like it used to be but it's not big either. It's like, almost-flat. It doesn't really bother me but I think some ab workouts could help. I don't think I'm overweight, but I just like my old body better. My knee is still healing so I can't run, although I can walk.

I just want to slim my legs and glutes, more than wanting to actually lose weight. To me, the number (130lb) doesn't matter, but my body fat does.

Could walking alone (about one hour a day) help me cut off about 5lb within a few months (since most of my fat is in my legs)? Or do you have any other advice?

I'm not trying to shape my body for others. This is for myself. I am still confident with my body, but if I could cut off some pounds, then why not.

Thanks for any advice!