Car Crash question in regards to the stop sign right of way.?

Suppose Maggie was headed north through a 4 way intersection but came across a stop sign in which she brought her vehicle to a complete stop, moved a little forward because the trees and parked cars were blinding her view. She looked both left and right prior to entering the intersection when didn’t see any approaching traffic, she accelerated into the intersection. Suddenly Pam appeared within the intersection heading west driving ped speed limit and collided with Maggie. Pam did not have any stop signs so Maggie was put down as failure to yield the right of way from a stop sign. Pam however received no citation for her speed. Are there any exceptions to the right of way rule which could help Maggie? (Hint: both women are above age) Are there any past cases which could help Maggie?