Jeniafrench

Hi, I filed a i-130 for my mother back in March. The case is currently being actively reviewed and no decision on the petition yet. My mom has a tourist visa interview appointment on Oct 12 scheduled probably about a year ago (she is from Russia, so things are complicated). She intends to go to the interview, as she would like to visit me in December for a couple of weeks (no intention to stay), prior to officially moving after the immigrant visa is eventually approved and issued. I understand that it is allowed to apply for a tourist visa and travel with a pending i-130, BUT is it allowed with an approved i-130? I'm looking at the immigration timelines, and I understand that hypothetically we may get an approval any day now. Any clarification will be appreciated.