FIrst off, some notes. Player cards are not considered to have a level, so you sadly cannot recur Regurgitation with Scrounge for Supplies. Few things can. Technically The Council's Coffer could, but that card's text might as well read "everybody skips their turn and cheats a little bit".
Her devour ability can also only target cards in play unless otherwise noted. While the cards in your hand/deck/discard/under ravenous are technically "player controlled", they are not valid targets for abilities unless specifically stated otherwise. That means you cannot use her fast ability to eat cards from your hand/deck/discard to speed up her growth, nor can you devour cards under ravenous to maintain a high statline. Nothing except Regurgitation or getting extremely lucky with Reality Acid can prevent her from losing control for several turns.
So, what cards does she like?
The obvious category is cards that cost doom or have a similar downside. The Initiate, Renfield, Alyssa and Blood Pact can all do their dirty work and get devoured before you're in danger of advancing the agenda. The Crystallizer is harmless, because you can merely devour it when the Guardian shows up. She can use her ability in support of other investigators as well, devouring their Renfields or Initiates so they don't have to dig for Moonlight Rituals.
The second category are cheap and fast assets to feed her ability. Intrepid can help someone in the mythos phase, buff them for a turn and get devoured before it would be discarded, zero cost/zero actions. Solemn Vow can be played on other players, allowing them to transfer their damage/horror to your own sacrificial assets, then devoured when necessary. Priest of Two Faiths can stuff the bag, soak damage/horror from your vows, and get eaten before he ever adds a single curse, all for 1 resource. She can Jury-Rig things and devour the rigging when it's out of uses.
The third category is anything that benefits from a balanced statline. Suzi can't depend on a static 5 like some investigators, but she'll spend most of the game with a 3 or better in multiple stats. Lockpicks and Suggestion for example fire at 6 or better for 5 turns in a row. Survey, Savant, Occult Theory, Defensive Stance and Dauntless Spirit will similarly be good to great for 5 out of every 8 turns.
In the fourth category, we have cards that lessen the impact of her low-stat rounds. Suzi makes great use of Borrowed Time, letting her essentially bank an entire turn to be spent later with better stats. Old Book of Lore and Encyclopedia can let you slot into a support role, using your weak actions to buff your more effective allies. In theory, the Sledgehammers benefit both buff and scrawny Suzi, using quick but innacurate strikes when you're strong and spending extra actions when you're weak.
Honorable mention goes to the suite of survivor cards like Rise to the Occasion, Against All Odds or Signum Crucis, which will always go off a base value of 1 for maximum effect.