If you are on MLS and listed through an agent, that agent should be able to fix it as the feed comes through MLS most of the time. If you are listed as a for sale by owner then you would need to contact Trulia which may be difficult. Not sure why the house next door would be showing unless an old listing not updated to your current one. Good luck.... more
You should see if you qualify for a mortgage first and ask the lender what your best option for that home and situation. If you plan to buy the home outright and then get an equity loan and can not you will be in a different position than you would like to be in.
She can always sell her home and you can buy the home that you want for her and yourself. Good luck.... more