It sounds like either the healer doesn't understand the hate level of their spells and therefore is trying to heal by spamming the higher tier spells or a combination of you and the DPS taking too much damage. Best advice here is to try your best to dodge the slipstream attacks to reduce your damage taken and tell the DPS you get to wait a little before opening up on her. Can watch the healer as well to see what spells are being used so you can tell them to stop over curing if that's the case.