First, from what I read, you do not have a wireless printer, you connect to your mother's wireless network. She has a printer on her computer that is shared. Now you want to print (through her) to her printer.
If that is correct, then, it sounds like the printer you have in your Printer selection is, or was, your mother's shared printer when you initially had your network only as hers. Since then you have gotten (and screwed up - so you said) your own network. I think your current printer selection, to your mother's printer, is invalid.
I would just delete that current printer selection, then get a new printer once you are on your mother's network again.
By the way, just so this does not go without saying, that setup requires your mother's computer up and running in order for you to used her shared printer. That also means that you both have to be on the same workgroup. A way to avoid those requirements is to get a print server box. That print server will put the printer on the network, so that any computer can access the printer without requiring any other computer to be on at the same time.
(Some of the newer printers are now coming out with network connections built in. Some of those network connections are even wireless. And those are not real expensive computers either. Something you might want to get.)
I have a Toshiba laptop w/windows XP home, remotely connected to my Mom's cable using a linksys router WRT54G w/her HP Pavillion desktop with windows millenium and her HP printer. It was working last year. Since then I have also added cable at my home using a linksys router WRT54G connected to my desktop which is an e-machine w/windows media center and an HP printer. I recently had Best Buy come in because I had screwed up my connection at home. He told me he hadn't changed anything at my Mom's and that all I would have to do is to specify her printer when I print at her home. Not true. I am trying to send a copy of a works spreadsheet. I pull up spreadsheet, go to file menu, then click print, when print screen appears I change to Mom's printer, then OK. Get "microsoft works" window that says "Cannot print the document. Close other applications and check that you have specified the correct printer port, then try again." Still doesn't work. I'm soooo frustrated, I hope someone can help. Thanks so much in advance for any assistance I am given.