The major hospital in Grand Prairie is "Grand Prairie Medical & Surgical Center"
909 Dalworth St. Their number is (972) 266-9088. There is also a surgicenter on Carrier Pkwy. There are other hospital in nearby Arlington too.
The area your friend lives in was particularly built to cater for seniors age 55 and older. There are several units for sale right now. There is a monthly mandatory HOA of about 160 and that covers the exterior maintenance of the units, all common areas including the community pool, the club house which has also a large meeting room, a fitness center. There is also a horse shoe pit on the 2.5 acre grounds with a pond. It is withing walking distance to the public library, post office and the Senior Citizen Center.
I hope this helps. Let me know if you have further questions.