Level | Class | Feats |
1 | Wizard 1 | Extend Spell, Alacritous Cogitation, Sculpt Spell |
2 | Wizard 2 |
3 | Binder 1 | Improved Binding |
4 | Wizard 3 |
5 | Anima Mage 1 |
6 | Mindbender 1 | Mindsight |
Notes: I decided to go for a relatively standard entry into Anima Mage rather than try an extreme early entry since you mentioned medium optimization. The mindbender level is suboptimal in the longrun (since at Anima Mage 9 she would become EBL 12, get to bind Zceryll and get Mindsight through that) but seems like a better pick in the short term. In this build, Anima Mage lasts until level 15, and if the game gets that high I'll figure out exactly what to do with the remaining levels at that point.
Obviously with mindsight she makes a natural scout, and as an Outsider she'll have access to nifty polymorph forms, so I imagine she's going to do a decent bit of melee in various forms. Beyond that, well, I'm sure she'd find a niche. If she ever starts to feel weak where she's not pulling her weight in the group, I'll probably drop three or more levels of Incantatrix into the build to pick up Cooperative Metamagic and Metamagic Effect, or well...something. But we'll cross that bridge if we come to it.
My alternate idea is to simply drop the binder/anima mage stuff altogether and go into Incantatrix at level 7, so she can maximize her buffing ability and be essentially the group buffer, as well as turning herself into a melee powerhouse. Possibly an Abjurant Champion dip at level 11 once she meets the BAB requirement, if I decide to burn the feat on combat casting to get in. It feels like this would be a more useful to the group build, overall, especially since as far as I can tell, none of the others currently are focused on buffing the group.