Way to go for giving your mom something back 
I also usually feel uneasy about working with relatives, but the people who gave birth to you are probably the most loyal ones you’ll ever find.
Now as for gambling news –
Register to some websites that publish gambling press releases, and have your mom rewrite the PRs.
The largest one I know is prweb.com, where we publish our own PRs. You can find casino, poker and sports news. Registration is free, and you can get your relevant PRs to your email. I think you just need to give them a credit.
An additional way to gather news is to register to casinos mailing lists to get their newsletters with all the promotions. Usually you need to open an account to join the list, but in 3 days your mom can be listed on hundreds of sites, making sure you deliver your visitors all the latest bonus news.
Happy Mother’s Day!