What about a friends computer? Is it usb or 3.5mm jack? I have a headset that has a 3.5 that plugs in to an adapter for usb. If similar is there a way to test just with 3.5 jack? Maybe an old phone/walkman/cdplayer/boombox or something. I know im showing my age here. thought about it and those devices wont help you test your mic but an old recorder might work.
Is there any internet café's/libraries near you, they might have what you need. It's worth a try but the more I think about it, since you have audio it's most likely a connection issue in the mic area. Might be able to find a repair shop that could open her up and maybe fix it.