[stomachmonkey]

You have two choices.

A hosted solution where you pay a monthly price based on the number of items in the catalog or roll your own.

Each have their pros and cons.

Hosted equals more money upfront / monthly out of pocket for the benefit of having a turn key solution and not be bothered with security, upgrades, maintenance etc.....

Roll your own means you are your own IT, for CC processing will need a merchant account and gateway provider. Depending on your choices you could expose yourself to financial responsibility should something go south.

End of day hosted vs roll your own will come out at roughly the same cost over time.

If she has just a few items and wants a professional, secure, hassle free way to sell then go hosted.

Look at Amazon, Shopify, Volusion