You should do it slowly and carefully because there is a high possibility of tendon getting reinjured again. Starting with a few walks and then putting a bigger load slowly and considering the previous results.
You can also use a stem cell therapy for tendon injury healing - it leaves no scar tissue when the injury heals and it reduces the possibility of injury reoccur.
What does you vet say? Usually in rehabs like this they give you a layout of how the bring them back and workload.
I rode a horse who was just recovering from an injured suspensory ligament and this is what I would recommend. Hand walk her for about three days for 15 minutes, walk her under saddle if she is doing good with the hand-walking. Be sure to give her a day of rest before starting the under saddle walking. I recommend walking for 15 minutes, then slowing increasing your time by 2-4 minutes each day. Monitor how she is doing every day! After about two-four days, do some VERY LIGHT trotting. Walk for 6 minutes, trot for 1, and do this slowly. This should be done for at least a week, with plenty of rest days. If she is okay with that, change it up. Walk for 5, trot for 2, walk for 4, trot for 2, etc. Remember, this is just my opinion and what I did with the horse I rode. Get confirmation from your vet via phone or text or whatever you would prefer. Again, just my experience. I hope this could be of help!
I would start of slow again. Roadwork walking then progressing to some trotting to help build up the strength of the tendon again . To much fast work to soon and you could cause more damage.