Hexes
Fortune and Cackle, are great in this type of situation, a free re-roll once a round can be a powerful thing. Hex your party up and stand in the back and laugh, they will enjoy it.
Healing is great hex, combined with a Caster Level 2 Wand of Hex Vulnerability and you have one of the cheapest way for down time healing. Talk your party into help buy a couple of those wands, as it also can be applied to Fortune.
Flight at 5th level is a must, mobility is king.
Spells
I didn’t see what patron you picked, but for a witch that cannot use her mind affecting spells as much I would suggest one like Elements, to increase your offensive capabilities.
Offensive wise, spells like Burning Hands, Ear-Piercing Scream and Snowball are great ways to get some damage out.
Throw Enlarge Person on the Fighter and with his reach weapon he can control the battle. The Monk will love the increased damage from Enlarge. If the Ranger is archery based, have them pick up some large arrows for Enlarge. Once you have them addicted to Enlarge, talk the melee types into purchasing you a couple of 1st Pearls of Power to feed their addiction.
I like to think of the Witch as the little sister to Wizard, her spells list is themed and definitely driven towards the mind affects. But there is versatility on her list you just have to be creative with it. Keep in mind that a witch learns spells cheaper than any other arcane caster, so you can have a wide array of spells to pick from.
Familiar
If you GM is going to be “that guy” and go after your Familiar. I would pick up a Familiar satchel soon, to keep it close at hand. I personally don’t like using my familiar to deliver spells as a witch, they mean to much to the class to risk.
