Final answer:
Keira did not break any fiduciary rules as she followed the sellers' instructions and did not disclose any confidential information.
Step-by-step explanation:
In this scenario, Keira, as a real estate agent, did not break any fiduciary rules. According to the given information, the sellers instructed Keira to not bother with an offer less than $290,000. Keira followed their instructions and did not encourage a lower offer. Additionally, she did not divulge any confidential information about the sellers' willingness to accept $290,000.