This from Tish's website:
Notice to Tish Hinojosa fans and website visitors:
Tish went in to an Austin area hospital for a routine day surgery procedure last week, March 11, 2015. It is unknown what occurred during the operation however emergency major surgery was required. After ICU and continued hospital care, she has stabilized and will be rehabilitating for six to eight weeks.

Our apologies for concert cancelations or for any inconveniences caused by these cancelations. Please check the website regularly. Tish will post recovery updates as she is able. Also, please expect ongoing emailing and business to run at a slower pace for the near future.
Thanks for your patience and understanding.