I see this thread has already received a couple replies on the Training BB but Ill reply here with a focus on some womans issues.
Due to differences in our body structure (e.g., Q-angle, muscle strength and balance, joint laxity tendencies, etc), many female runners seem to be more prone to knee and other lower body joint injuries than male runners. In addition, a tilted pelvis, often the result of scoliosis, is more common in women than men. It is possible to correct/mitigate many of these conditions via PT, good shoes, inserts, strength training, etc. and get back into running, but I think its also important to respect your body and not push it too hard too fast.
Assuming you have your doctors approval to return to long distance running, Id recommend that you first shoot for a ½ marathon. Think of running as a long term activity that will always be there for you to do if you stay healthy and injury-free. If that goes well, then consider doing a full marathon.
In training, you might do better building your mileage more slowly this time and doing some alternative low impact cardiovascular workouts instead of some of your runs to maintain/increase endurance without the pounding. Also, perhaps consider getting with a personal trainer to design a custom strength training and a stretching routine for you. Above all, listen to your body. If you feel pain, back off. If you feel very tired, rest.
Best of luck to you in making your decision. BTW, I ran Disney last January too!
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