Marvellous Marie.

Thought I'd give Ms Lambeau a shot, after a number of tweaks, this is the deck I've had the most success with. It is imperative to get Shrivelling and Arcane Initiate out asap, mulligan the whole hand draw if neither are in it. Holy Rosary is the next in line of importance.

You can't rely on her strength so fall back on her dexterity/evade if trouble strikes early on..including a couple of Stray Cat might be reasonable. She even has problems with Swarm of Rats.

Upgrade to Blood Pact and Spirit Athame (4 xp total) and dump a Guts.

Baron Samedi can actually be a good Ally, as long as Marie avoids damage.

After Blood Pact is introduced, Moonlight Ritual is a must as it gives you further control over her Doom ability, which is critical with quick agendas, Blinding Light can probably be sacrificed. Then at least one Charisma and St. Hubert's Key, which may also entail getting a Relic Hunter. With Delve Too Deep, you should be turning in 5 or 6 xp per scenario.

Other obvious upgrades are Shrivelling and Ward of Protection. If you're playing Dunwich, get Dr. Henry Armitageif you can, for his card draw/resources ability. Also Survival Instinct could be changed for Deduction.

She works well solo, but is better as a clue gatherer and offensive back-up. I had great success with this deck and https://arkhamdb.com/decklist/view/4351/william-yorick-nervous-wrecking-machine-hard-mode-1.0 by StartWithTheName.

Voila...