I'm truly appalled at the lack of professionalism demonstrated by your Agent. I too also believe it's the Buyer's Agent duty to obtain the keys (and remotes, etc...) and then turnover to the Buyer(s).
Seriously, was it too much trouble to have someone from her office provide access?
Here's what I would suggest you do:
Contact the Agent's Broker, which you can find by going to DRE website below:
Enter the name of the agent, review the results, click on the correct individual and then see the "Employing Broker:" info. Then call, explain the situation, and let them know when you want access tomorrow. A reputable group will oblige your request immediately.
In a time when the memory of your Agent should be positive you will always recall the disappointment and frustration of having to jump through hoops just to obtain possession of your home. I can imagine your response when and if this Agent asks you to refer family and friends.
But I would definitely contact you agent or their broker and demand immediate resolution. Good Luck!