Welcome to the Quilting Board!

My SIL asked me to repair a quilt his grandmother had made when he was born (not crib sized). It was a lot of work but got'er done. There were a few tears and seams had come loose but the main problem, most of the machine quilting had started to come loose. I ended up hand quilting where the machine quilting was, removing the machine quilting as I went. Thank goodness it was mainly straight, not meandering! Now I try to hand quilting unless it will be an everyday, wash once a week quilt. I am afraid the machine quilting is not going to hold up like the hand quilting of yesteryear.
Better to do something imperfectly, than nothing perfectly.
Done is better than perfect.
If you have a badly worn patch or one with a hole, applique a new patch over the original. This will maintain the "original" age of the quilt if it ever gets dated in the future. I was told this by an appraiser, and have followed it on my 1870 family heirloom baby blocks quilt.
Retired math teacher --
I CAN FIGURE IT OUT!