Hows this look? any tips?

A few days after Jack bought a surfboard from ABC Surf Shop (ABCSS), in Waikiki, he realizes he could use a surfboarding lesson or two. Jack returns to ABCSS, walks up to Jill and says, "If you have time on Sunday, I'll pay you $50 to give me a surf lesson. I can meet you here at ABCSS Sunday morning at 7:00 a.m." Jill responds, "Sure, you got a deal, see you Sunday at 7:00 a.m." On Sunday morning Jack shows up to ABCSS at 7:00 a.m. with his surfboard, and Jill never shows up. A day later Jack is told from a friend that Jill was in a car accident and broke her arm.

Issue - Did Jill breach her contract with Jack?

Rule- Unilateral contract, A contract that results when an offer can be accepted only by the offeree's performance. A unilateral contract is formed not at the moment when promises are exchanged but at the moment when the contract is performed.When one party breaches a contract, the other party the nonbreaching party can choose one or more of several remedies.

Analysis - Jack and Jill agreed to an Unilateral contract. Jack and Jill agreed that Jill would receive $50 dollars if she showed up and taught him surf lessons. Jill breached the contract because she got in a car accident that broke her arm and couldn't perform the surf lesson Sunday at 7:00 am. Jill never reached out to him. Jack found out the news from a friend a day later.

Conclusion-Jill breached her Unilateral contract with Jack.