You could try the Immediate Magic alternative class feature from PHB2. It a trade for your familiar and is force based. Also you could look at the Invisible Needle reserve feat for 5th level.
EDIT: Won't you get Greater Spell Focus (Evocation) for free next level?
Yes, Francheska gets Greater Spell Focus (Evocation) for free next level from Master Specialist L3.
If Leif will approve it, I'll drop the familiar and take the Immediate Magic alternative class feature from PHB2 for evocation. I think Counterfire is cool.
For my CL5 bonus feat, I thinkFiery Burst (reserve feat CM p.43) would be perfect for Francheska. Is it a ranged touch attack?