We could say she 'sold' it or broke it down or whatever. She's not really big on summoning zombies. It gives folks the wrong impression. 
Plus, staves in 3e are reeeeheeeeally different than staves in 4e. In the first, they're spell batteries. In the second, they're essentially weapons that enhance magic power.
Converting one to the other would be difficult. More so than it's probably worth, especially for an item she doesn't really want in the first place.
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As for how to make wildshape more useful...
You could Paragon Multiclass into Druid. That gives you a Druid at-will that's REALLY at-will. Also, take a look at druid feats...some of them affect you while in Beast form and can be pretty nice. You qualify for druid feats even without Paragon Multiclass.
You might bat your lashes at IG and see if he'd okay swapping one of your barbie at-wills with a Beast at-will from the druid class too. This is no net gain in powers, so it wouldn't be unbalanced. As a human you get 3 at-wills, so you could spare one without much trouble.
It'd be a house rule, but I think a fair one...and since a Barbarian/Druid MC is really not optimized in the least (quite the contrary), it'd be a nice gesture.

Plus, staves in 3e are reeeeheeeeally different than staves in 4e. In the first, they're spell batteries. In the second, they're essentially weapons that enhance magic power.
Converting one to the other would be difficult. More so than it's probably worth, especially for an item she doesn't really want in the first place.

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As for how to make wildshape more useful...
You could Paragon Multiclass into Druid. That gives you a Druid at-will that's REALLY at-will. Also, take a look at druid feats...some of them affect you while in Beast form and can be pretty nice. You qualify for druid feats even without Paragon Multiclass.
You might bat your lashes at IG and see if he'd okay swapping one of your barbie at-wills with a Beast at-will from the druid class too. This is no net gain in powers, so it wouldn't be unbalanced. As a human you get 3 at-wills, so you could spare one without much trouble.
It'd be a house rule, but I think a fair one...and since a Barbarian/Druid MC is really not optimized in the least (quite the contrary), it'd be a nice gesture.