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Hiya!
The other Players Cleric character is not your personal magic item.
Sorry for the cold hard facts, but, uh, does she get to decide who you attack? I mean, what if she picks a fight with the corrupt town watchmen who are trying to shake down some old peddler in the street? Can she expect you to jump in and start hackin'n'slashin'? What about if she's down to 20hp, and you're only down to 40hp? Is she to expect you to jump in front of that thrown boulder from the stone giant? I mean, it's your "job" isn't it? To take damage and fight?
The point is this: She gets to decide if, when, and who she heals with her god/desses magic. Clerics are NOT "heal bots" that are just there to provide healing support as their "main objective". A Cleric is a class; the Player plays them the way they want, not the way anyone expects them to. Now, admittedly, each Class
does have a "forte", and the Cleric's is to protect and heal/revive, but anyone playing in a group that has a Cleric should NEVER 'expect' to get healed whenever they want, need it, or think they need it. Doing that is a sure fire way to get everyone in the group to never ever ever want to play a Cleric. You think you have it bad now? Try it when everyone refuses to make a Cleric because "everyone is always begging for this spell or that spell and it's like I'm not even playing my own character...so why bother?".
...just sayin'...
^_^
Paul L. Ming