New negotiations tactics in today's market to get your clients full price or higher offers? is this the new norm?

Hi All,
I wanted to share with you a scenario I am experiencing now with an agent.  I showed a home yesterday, came back to my home office and prepared a contract, a very good contract to say. The comps are almost non existent so there may be an issue with appraising but put together a good contract for my clients. 
I submitted the contract along w/all the addendums but was waiting on my preapproval and told the agent that I get that to her as soon as I receive it. 

Emails last night, back and forth goes like this:
Agent:  Discussed your offer with the seller.  At this point, they are so overwhelmed with all the showings and disruption of their schedule, they have asked for your clients to be kind enough to wait until Tuesday evening before they respond.  

Me: Are there contracts in?

Agent: I do not have seller’s written permission to disclose that kind of information.  We have had many showings and it’s a very nice property in a fantastic neighborhood.  It would be a shame to lose this wonderful home by not recognizing this is a seller’s market!  If your buyers’ want to send a better offer, they are welcome to do so! 

 Me: really,  I didn't ask how many were in just if there were any in.  Since we need to wait until Tuesday will you be doing highest and best?

Agent: I can’t add to what I already indicated.  Sorry I’m confusing you. In this seller’s market, it seems like good advice to all buyers to make the best offer they can so they don’t have to risk losing a home they love.

Me: I am not confused. Why would I want to have my clients go higher when you're not asking for highest and best? and making us wait until Tuesday? That's what's confusing. It's late, I'll give you a call tomorrow, thanks

Agent: Than don’t.  We’ll see if my clients counter.

This morning I sent her the pre approval then thought about this and felt the agent may have not shared the contract and added a owner's confirmation of receipt of written offer.  This may piss her off but at least I know I am working for my clients as best as I can.  Is this the agents negotiating to get a full price or higher contract? Just an example, list price $279,000, we went in with a $270,000 which wasn't too bad to start and keep in mind the appraisal may be an issue, only 3 homes have closed in this town that an appraiser would use.

I'll keep you posted to the outcome  :)
Have a great day! Colleen