Is There A Problem With This Plan?

No, This Plan Is Great!

"I've never seen a formula for a 'splash potion of temporary monster taming', so I can't brew one," Molly says sadly.

"That's not a problem actually, among other things that I am not sure how I know them, I know that and a few other related potion formulae, such as a Splash Potion of Psychic-Power-Points Restoration I & Splash Potion of Regeneration I; does learning these formulae interest you enough to make a bargain with me?"

Molly considers for only a matter of a couple of seconds: "Yes! Very much so! Splash Potions of Regeneration I sell for around 5,000 GP on the open market, so being able to craft them myself would be an immense boon!"

"Good, then let's begin..." You say and start instructing her on how to brew the Splash Potion of Temporary Monster Taming.
Fortunately, she has all the necessary ingredients for it in her packs and pouches, but unfortunately, some of them she only has enough for brewing it, and they are also needed for the other special potions you are teaching her the formulas of, so she can't hook you up with potions of regeneration and such before this fight. That means that you are going to need to have more allies, and you know just where to get them...