Feb 12, 2016 - 07:21 AM
"In" is a two-way preposition that can be used in the dative case and sometimes the accusative case.
I believe the "in" in the 2nd second sentence is used in the accusative case and this is why it's ihr rather than ihm.
"Gehen Sie auch in ihr Buro"
Implies that you are going into her office (movement), which would require the accusative case.
While the first "in"
Frau Meyer ist in ihrem Buro
describes a location which uses the dative.
I hope this helps!
Feb 12, 2016 - 07:41 PM