Sounds like over-zealous (or possibly new) attendant. There's no way I would have let her 'seize' the food I had already taken, and she was definitely out of line on the no coffee, as the lounge is available 24/7 for that purpose. Did you mention it to the front desk when you checked out? What did they say? I'd consider emailing the GM of the property. Even if the attendant was correct about start time (if anal), the saying no coffee & seizing food is ridiculous, as is the attitude.
I had a few stays at the property in Feb & the staff, both morning & evening, were pleasant, so I didn't encounter Miss Crankypants. And on my early morning departure I had to be at the airport shortly after 5am, so I didn't bother w/ tea from the lounge but that would have been well before start time.
Cheers.