There were rope bridges across the wide gaps. Where the buildings were close they were joined with plywood doors nailed together, welded metal doors, ladders. She was small, they didn’t have to be strong.
A new bridge or ladder meant a new building to search for supplies. Rooms, apartments, offices to be cleared of the walking dead. When the solar charger had finished powering up the portable nail gun, she could go where she pleased. She had plenty of nails.
There would be other survivors, and they’d find her. She’d have built a safe place for them when they did.