freezing at home isn't going to work very well if at all - it doesn't freeze the swimmers quickly enough, so the tails that are needed for them to swim are going to be useless, making the whole sample useless. effectively the freezing process in a home freezer with denature the proteins and screw up the sample. when it's done by a clinic, the freezing is almost like "snap" freezing, and i believe they use liquid nitrogen so it happens immediately.

if your friend is wanting to get pg but having issues with timing, it may be better for her to investigate intrauterine insemination and get the clinic to collect, clean and store the swimmers and transfer them when she O's - home insemination, from what i understand, tends to only work with fresh samples - highly unlikely to get any decent sperm (if any at all) if frozen at home