What To Do About DCG Who Cries When I Leave The Room?

[Breezy]

My newest DCG is starting her 3rd week here and the transition is getting much better. She is 16 months. The only problem now Is she cries and then screams when I leave the room when she is in her high chair or when I step over the baby gate into my bedroom to use my ensuite bathroom. She can still hear me and see me as I wash my hands but the screaming lasts until I am back in the room.

I have been talking to her as I use the bathroom and saying its ok and I wiol be right back, ringing her songs, or even saying 'ok that's enough crying" nothing so far has worked.

I feel like I am walking around on egg shells every day with her. WWYD?

ETA: When I am walking away when she is in her highchair it is either while I am getting her food ready or when she has finished eating and has been washed up and I am just getting stuff ready for her to get down. I do not leave her alone while eating!