Well Sandy~ I know how trying this has been for you all and being so far away has got to be very hard also. Just cherish all the time you can w/your Mother. You will never regret it, although there may be more trying times; you and I both know that there's only one Mom.
If it's any consolation, my Sis and I had to take the reins in regards to my Mother's care also, the bro's were just too "busy" to help out. I don't regret one minute spent w/her. All you can do is try.
You have my utmost respect for doing this for your Mom.