You quickly wave hi to them and point towards your phone and tell them to give you one sec
You: Heyyyyyy Mom, what's up?
Mom: Nothing much honey, just on my lunch break at work and figured I'd give you a call
You: Oh well thanks for calling...
You realize that maybe now really isn't the best time to ask such a question, so maybe you can stall until you make it to Meadows. But also you kinda really need this money.
Stall (ask her how her day's going)