2008 Macbook Pro wont print through Airport Extreme

Hi,

We recently got an airport extreme and have our printer (Epson Stylus NX400) plugged into the USB port. My computer (2009 MacBook Pro running 10.6.8) will print wirelessly fine but hers (early 2008 MacBook Pro running 10.5.8) will not. Plugged in it will print just fine but it is a hastle to unplug the printer from the airport and plug it into her computer any time she wants to print. When she tries to print wirelessly, the print command goes through but then doesn't show up on the print que. The only difference I see between our computers when we print is hers pulls up some information from Epson regarding ink levels when plugged into the printer. Any help is appreciated.

Thanks,

Harrison