When you filed the I-130, you declared your mother as an intending immigrant. Her tourist visa is a nonimmigrant visa. You can't ask for immigrant and nonimmigrant relief. However, the fact that her tourist visa expires is not a pro-blem, as long as she remains in the US until her case is processed. For example, if she should t-ake a trip after the expiration of her tourist visa, she might have difficulty re entering.
USCIS is about to schedule your mother for her Biometrics - fingerprints, photo and signature. That is why you received the notice on 9-25-2012. You will receive a notice for that next and then USCIS will schedule your mother's hearing.
Right now, everything looks good.
She need not, and in fact cannot extend her tourist status now that she has applied for permanent residence. So long as her I-485 is pending, she is lawfully in the U.S. If she attempted to extend her tourist status, it would be denied due to her application to live here permanently, which is in conflict with being a visitor.