Spellsingers are wizard types. You shouldn't have your pony out unless you just want something pretty to look at while you sit in town. If you want to play w/ the summons, go ES.
As a spellsinger you will no longer get any upgrades to your ponies, they will stay in the 30s, after a while the purple one will no longer recharge you because of the level difference.
I wouldn't have spent SP with them ponys from the very beggining. Summoners and nukers have different gameplay styles, you gotta get used to being a nuker... :P
i love the ponys, do you know how many times i've won in pvp just become someone thought that i was a elemental summoner and tried to kill off my pony first before i nuke them to death.