I assume she has been tested at least once for a unitary tract infection. Even if she tested negative, the use of a catheter always carries the risk of infection. Too bad the nurses chose to use a catheter rather than answer her call bell. I think it would be better for her to use an incontinence pad with the instructions for her to urinate in it rather than to put her at risk with cauterizations and then an indwelling catheter. At least the tibia should heal and she'll be able to go to the toilet again on her own.