HELP HORSE EXERCISE SCHEDULE?!?!?!?

I have not ridden my mare for about 2 months due to a lameness. I have been lunging her for 10 min every day for about 1/2 month mostly just walking. I am hoping to take her camping nest weekend. Can I get her in shape by then? If so what should her workout schedule be? Please note that she wasn't lame to the point where walking was difficult, just riding so she was still ripping it up in the pasture. Please only answer if you are experienced (not to be rude... i'm only 16 myself) It wouldn't be to hard of work it is hilly but not too bad and maybe 4-5 hours over 3 days. Please help and give me all the info possible