Need to boost my wireless signal for remote laptop

2wire network works fine in main house. My mom lives in a mobile home adjacent to the main house (approx 100 ft from router). I tried a Hawking range extender....it works only intermittently and drops the line repeatedly.. Feel like I need a different configuration or different equipment to accomplish what I want. Mom frustrates easily and needs reasonably reliable internet access..

What are my other options ..... antennas, other range extenders???.... Would be willing to pay a network savvy tech to come onsite and setup, but don't know who to call. I live in extreme South Texas.....not a lot of high tech gurus here.

Thanks for your help....

Debbie