Answer:
Functional fixedness.
Explanation:
This can be explained to be a cognitive bias or a mental disorder that a person see an object to be working in a particular way. That is why Bella in the scenario above did not see her trash bag for on trash disposal; she was reasonable enough to use it to save her current situation.
However, some people see it important to have fixed functions for things to a certain point, because the failure from it can cause confusion, doing more harm that can leave him hospitalized or even dead in some cases i.e doing more harm than good to the said person.