One year, I was stuck in HORRIBLE traffic in the parking lot at a NASCAR race (not my favorite pick of places anyway..) in the rain (not great weather for a NASCAR race...) 250 miles from home, and my non-horsey neighbor calls to say my mare is acting funny, and she thinks she is foaling. GREAT!!!
Turned out to be a false alarm. I could hear Molly(the mare)laughing ALL the way from Dallas!!
I think you should only check on her when you feed, and don't take your phone with you. Act VERY cool about everything. Go hm-hmmm-hmmm while you walk around, and just sort of peek at her udder, then leave. You do not care if she has a foal or NOT.