You probably have a SD card reader in yours, and she has a SDHC reader.I dunno, mine works fine. Loaded mine with a couple of movies and it plays good. I did have a momentary freak out because it wouldn't read in my laptop, but then I tried it in my fiancee's laptop and it works fine. I think it might have something to do with the fact that my laptop is almost 5 years old and the card is a micro sdhc?? I'm not an expert buy maybe there is one here who can clarify if this is an issue with your phone too? Worst case scenario you can call customer support and return it.
Would have been nice if the EVO had come with an SDXC slot.

I've worked retentions before but this was brutal. Maybe Sprint is seeing such a high demand for the phone that they've told retentions to back off the concessions?