D.N.
My son has had them and the freeze thing usually worked. My daughter got one on her finger. She thought it was a blister and tried to pop it. When she came home from spring break last year, she went to the doctor. Before sending to a dermatologist to have it taken care of, the doc suggested the wart band aid type medication. It worked but did take about a week or so to show that it was working and then another couple weeks to heal. Definitely have her wear flip flops or similar in the shower to prevent spreading. This is a common issue school dorms so she definitely is not alone.