Dogs horses goats and neighbors with guns 

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That's a great idea for smaller critters. If she upgraded to 2" DWV for the inner and 4" for the outer. it should work for larger pests too..DWV= Drain, waste, vent... a lot cheaper than schd. 40.I don't live around bears so I have no idea how they climb....But what about a bigger version of what we call a coyote roller? You can do a homemade version like this one (scroll down a bit to where it says "rolling pin version"): http://www.huskycamp.com/security Basically you could string a thin PVC pipe through a wire, put a big fat piece of PVC over the thin PVC so that the fat pipe rolls over the think pipe like a rolling pin. This is mounted horizontally atop the run. The idea is that as the bear puts his paws on the top of the run (or fence) he can't get a grip as it rolls and he spills over backwards. Perhaps bears climb differently than coyotes and this won't work at all. But I thought I'd mention it as an idea.
By the way, so sorry about your bird! Good luck keeping them safe. I have lost a lot of sleep lately as my cats have disappeared one by one at night (four in just a few weeks now) so I know how you are feeling!
Keep us posted.