Take another look at the sentence:
Starving but broke, Rhonda called Aunt Martha, whose generous nature and
well-stocked cupboards would provide Rhonda with enough food until payday.
Starving but broke, a participle phrase, comes right before the noun Rhonda. Whose generous nature and well-stocked cupboards would provide ..., an adjective clause, comes right after the noun Aunt Martha. These are clear and logical pairings of targets and modifiers. There are no errors.
Before you continue, review the rules for misplaced and dangling modifiers.