Selis is purchasing:

Protection from Arrows Potion (300 GP)

Barkskin Potion (300 GP)

See Invisibility Potion (300 GP)

processed

She is also going to buy a potion of Cure Moderate Wounds+3, for 300 dollars.

CMW base cost is 300, you don't have enough GP for a higher slotted CMW potion. I've added the base potion to your sheet. It heals 2d+3 on it's own so I think that's what you meant with the +3 (since that's the minimum caster level) and not a +6 total