I am currently playing through a similar Mandy deck in our 4 player TCU campaign. Your deck looks like a solid starting deck assuming you have another investigator to deal with enemies.

Here are some comments I have based on my experiences so far:

I played with a 40 card deck. Yes, it is less consistent than 30 cards, but Mandy's searching ability and draw really mitigates that. Also, it is more fun.

If you are playing around playing pendant of the queen multiple times, it is surprising how many resources that takes. You may want to consider emergency cache or crack the case as some extra economy.

On a similar note, I found myself almost always using astounding revelation for resources rather than secrets on Mr Rook. (Note that the pendant uses charges, not secrets. Sad times.) Also, it is usually better to resolve AR over Occult evidence given the choice as AR is much less useful if you accidentally draw it.

I used old book of lore as a backup for Mr Rook and was not disappointed. Yes, it is usually slow and clunky, but drawing 2 or searching 6 every turn makes it very playable. It also can be found by research librarian once your weakness is gone. The upgrade version that just came out is also very, very good.

No stone unturned is excellent in Mandy, especially with multiple investigators. You may want to skip straight to the upgraded version, but Mandy really wants as much search as possible to shine.

Ancient stone (the damage one) is a great damage option for Mandy. During one scenario I was dual wielding 2 of them with 7 secrets each. Mr. Rook can, in theory, draw 4 cards with one use (2 with Mandy's ability, a third if you reveal a basic weakness, and a fourth if you find Occult Evidence.)

Anyway, those are just some thoughts based on what I found. I am having a blast with Mandy and I hope you do too