The tambourine is distracting, it falls out of rhythm too much (but I get the idea of what you were trying to do - just needs to be tighter with more intent).  
The piano is very low fi, which isn't bad, but perhaps slightly too low fi and sits too center.  Even a tiny bit of stereo spread would help IMO.  
Her vocals sit nicely with a nice chorusing/stereo pan effect to widen it.  The vocals definitely carry this.  Good song selection (I'm a QOTSA fan).