Ask the other person to open Tools -> Options -> Audio settings. What settings are shown there for Speakers? Are there more than one option available in the selection box? Try to press the green test button next to this selection box. Any sound?
The other person here me and i've tried everything ( i think ) and its not her speakers
Have you tried to make a test call to Skype Echo Sound Test Service (echo123)? Can you hear your own voice recorded?