For "altitude" any of these answers are plausible and equally valid for unspecified topography.
a) Gail went upstairs at home
b) First house and second house both same distance uphill
c) Split-level house; top part on same level as her house
d) Start of trip to friend's house is uphill, then levels off
The part that gets me is the vertical line. Does she jump off a cliff? Assuming it's meant to be distance, she what? Teleported?
