Your cat may treat you like a war criminal upon your return but she'll be fine. I wouldn't leave the ming vase out or the catnip planter but keep in mind most cats do better without their masters than the other way around.

I learned to communicate better with my cats. And tell them i will be away for X sunrise and sunsets. I even tell them i going away bit will come back before the sun sets. It sounds strange but i feel that my cats understands me better when i use the sun as time 😄

Each day you/the sitter can split up maybe half the dry food and hide small piles around the house for her to search for and find during the day: in window sills, open wardrobes, under a piece of paper on the living room table... check on the hiding spots and if she missed any select an easier location for the next pile.

If you're in Europe think about the heat.

What you have already planned sounds great! If you give treats regularly, you could set up an auto feeder (the rotating bin style) with dry treats.

Get a cat sitter who can spend time with her.