Yeah, this can work too but imo a wolf is more like a druid kinda thing. Since there's no such option as Summon Wraith or something I'd probably go with Earth Elemental.
Btw Circle of Restoration is a nice touch to complete the Witch build.
I like the Earth Elemental for a Witch.
The Iron Golem, less so. So we could learn Earth Mastery II, and stop there.
Hey, it would be possible for a witch to have the spell Earth Mastery II plus the skill Summoner III at level 7! Would be a bad ass witch