Tendon Injury

My mare strained her right fore tendon about 4 months ago.  I'm going to give her a couple more months off, but she is looking much better right now.  I was wondering the best way to start her back into work.  She is only a trail horse due to a previous permanent injury that caused some bone growth on a joint.  She was sound for light riding before the tendon injury.  I want to get her started in a way that will greatly reduce the the chance of her reinjuring the tendon.  Any advice that you can give me would be great.  Thanks!