If she did all this with the disinfectant and towel after the sex, how is this a risk? After sex is over, there is no more risk.
And from here on out, don't let anyone put anything on your penis - or anywhere on your body - unless you know for sure what it is. It probably wasn't some kind of disinfectant - I can't imagine why she'd be concerned about cleaning your penis, but I have no idea what it was. In any case, there was no risk for any STD from this, and don't have sex again until your penis heals.