This is a recent requirement. When she got it before, the BC was not required. This has been implemented recently, before about 5 or 6 years ago all you had to do is show your existing license. I lived here for 30 years, just bring the existing one and it was a done deal.
When I moved back from Louisiana, I had to get a BC to get my Texas license, hadn’t seen it in 30 years, cost me 30 bucks I think it was and over a month wait.
I think now once you show your BC, they have it on file and you no longer have to bring it.
Since she had a driver’s license, can’t she get an ID card through DMV? It’s a service for people like her.