Birdie girl,
For tight IT band you can buy something called "The Stick" which is a flexible rolling stick that you can use on your band, quad and hamstring. Thye sell on Amazon for about $30 and your PT should know of them. They work great and you can use as much as you like. You might want to investigate getting some massage therapy. My PT had me find a massage therapist who specialized in lymphatic drainage massage and I have been seeing her once a week since week two and it has been an enormous help in reducing the swelling and stiffness. Pool therapy would also help. It is to be expected that you will feel odd sensations, pulling, tightness, etc. in your leg muscles for awhile. My leg feels funny when I walk in the pool all the time, but I try to ignore it and just keep at it, as I know that my leg muscles are having to be retrained and it takes a long time. The pool therapy and spending some time in the whirlpool will help your ROM and your ability to ride the bike. I know this can be hard to do, but you need to put your knee and healing first, before grocery shopping and spending time with the grand kids. Remember, it is only temporary, but you will reap dividends by doing the things for it that she needs to heal. Their will be a light at the end of the tunnel. Walking is still the hardest thing for me too so I understand. Keep your chin up!