I believe she'd need to go back to an instructor and re-take only the proficiency portion of the test. Assuming she passes, the instructor would give her an updated proficiency certificate (and submit the update to DPS as well). Then you'd fill out the DPS form and submit it with the new proficiency cert and voila....
Here's the DPS form...
http://www.txdps.state.tx.us/InternetFo ... CHL-70.pdf" onclick="window.open(this.href);return false;
DPS Form CHL-70 wrote:Modification of License Action Type - include two recent color passport photos, a signed photo holder, and the original copy of the new handgun proficiency certificate.