Question

Lillian walked

towards her office building, knowing her boss would chastise
her if she arrived even five minutes late.

Answer 1

Lillian walked fearfully towards the office building, knowing that her boss would all ready be waiting to chastise her for arriving even five minutes late.

I changed it from a passive voice into an active voice. Hope this is what you were asking for? I hope this helped some :)

Answer 2

she will late if she arrived five minutes late