Hi Tesia,
Sorry to hear about your friend's predicament. I trust that this was not done in a salon or spa.
I hope that to help her present acne condition, she isn't taking/applying anything like Accutane, Retin-A or anyone of their generic versions. Waxing while using these meds can cause negative results to the skin. Also waxing shouldn't be done especially if you've exfoliated within the last 24 hours.
There are wax products slated for sensitive skin that she can probably try (should she care to venture down this path again).
N.B. - If you are a diabetic or have asthma, you should not wax at all. Reason being, the pulling of the wax strip is done rather violently and can
a) cause bleeding which isn't good for diabetics due to their poor healing qualities and B) be the catalyst causing an asthmatic to have an attack.