Final answer:
Isabel supplies information about Lockton and the Loyalists plans to General Gage, who is sympathetic to the Americans.
Step-by-step explanation:
The patriot commander that Isabel supplies with information about Lockton and the Loyalists' plans is General Gage. Isabel gathers alarming information concerning British intentions, such as the order to seize munitions and rebel leaders, and she shares this information with General Gage, who is sympathetic to the Americans. This communication helps the patriots stay ahead of the British and aids in their efforts to resist British control.