彼女を見送ってたところです。

she; her; her; girlfriend; sweetheart

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to see someone off (at a station, an airport, etc.); to escort (e.g. home); to follow something with one's eyes until it is out of sight; to let pass; to pass up (an opportunity etc.); to let a pitch go by (baseball); to watch a batted ball go into the stands; to shelve (a plan etc.); to postpone; to have someone related or close to you die; to bury someone; to take care of somebody until he dies; to wait and see; to continue (e.g. in legal contexts)

place; spot; scene; site; address; district; area; locality; one's house; point; part; space; room; whereupon; as a result; about to; on the verge of; was just doing; was in the process of doing; have just done; just finished doing

be; is