Andromeda is bad.
Or well, more like, Andromeda is Cass with slightly more heals and no Dispel. The more heals simply is NOT worth the SP until you have Gawain, Cass, Mordred, Joan/Dartagnan, preferably in that order. After that, feel free to grab extra heals from Andromeda if you want, but don't be afraid to use Cass over her.
Also, the res sucks ass. It only gives a little bit of HP so the Hime who died will basically just die again when they come back into the fight (they go to the last slot in the back row), not to mention that their skills don't even come off cooldown until they're back the front row.