I would highly recommend Cardiovascular Specialist of Lewisville. They have several offices in the area and you could choose which one was most convenient.
The lead physican is Dr David May. He has several partners, some of which have been with the practice for 10+ years.
I used to work with them and I can assure you that they are very, very good and very caring. Some of the Doctors joined the practice after I left, but the ones that I know personally are: Dr David May, Dr David Haynie, Dr Mitch Kruger and Dr Shirley Williams. If you do make an appointment, be sure to tell them that B. and Chuck Dunn referred you. PS They are my husband's Cardiologist, too.
My best to your Mother....being away and having to go through that experience can be very hard. I'm sure she is glad that she is with family, now. And that is how this practice operates...as one large family. I think you would both be pleased.