We've taken her inside in case she gets cold, wet or lonely.

To answer your questions:
-The little Vagina Museum dalek is made of stone or concrete, she's very heavy
-We are watching her closely just in case she's a Weeping Angel hybrid
-We have a lift. We're fucked if her intentions are nefarious.

To answer another dalek-related question: we know our visitors. They're awesome. Many are not typical/stereotypical museum visitors. It's entirely possible that a visitor:
1. Owns a concrete dalek
2. Takes it out with them
3. Is sufficiently neurodivergent to not notice a heavy concrete object falling out of their bag.