You should hire competent counsel to help you with this. But yes, all the applications are filed concurrently. You will be interviewed and if she is approved she will get her green card. A lot of forms, procedures and evidence goes into this simplified statement though and I would at a minimum consult with competent counsel instead of blindly sending in some forms.
It is correct you can file the I130 and i485 together as an Adjustment of Status packet. But there are a host of other forms that must accompany these two. Consult with an attorney who can help you properly petition for your mother.
Samuel Ouya Maina, Esq. 415.391.6612 firstname.lastname@example.org Law Offices of S. Ouya Maina, PC 332 Pine Street, Suite 707 San Francisco, CA 94104