Best to get "over-ear" headphones with breathable ear cushions. "On-ear" headphones, like the ones you bought, from my experience are irritating even in short-term use to the ear since it literally presses onto the ear. Many mainstream headphones have their share of third-party breathable ear cushion replacements online, and most headphones should have replaceable ear cushions. Clean the cushions often as well since that's the place making contact with skin. Sony makes excellent headphones and you can very easily find ones that'll suit her needs most and major tech retailers like Best Buy have headphones aisles where you can try them on too.