Indoor Dog Question

Posted a thread the other day about putting my Great Dane down (appreciate the kind words in that thread).

I also have an Australian Shepherd. Both were outside dogs for the most part. Now the Aussie is indoors with me full time. She's 10 years old and just super chill. No accidents and I take her out to play fetch about 4 times a day.

Trying to determine how much of her laziness or laying around is just her doing what dogs do vs. how much is her grieving missing her friend. She's been sleeping and laying around virtually the whole day she's inside. She wags her tail from time to time but far less than prior to Friday (her friend's last day).

The biggest problem I'm seeing is she hasn't eaten a bowl of food since Friday. I've been giving her treats and cooking her eggs here and there. I have to hand feed her at that though. Today I didn't cook her any eggs to see if she will eat her food again. She hasn't eaten. Doesn't show any interest in food. I imagine the not eating is probably a sign of her grieving and may be normal for this point in her grievance. Should I keep doing what I'm doing or cut out the eggs and let her eat when she's ready? I've been showing her more attention than normal. I'm giving her maybe 8 treats during the day which isn't enough to replace the calories she's not eating. She's healthy otherwise though. Not skinny or anything. She is drinking and peeing so that's good.

What more can I do to help get her past the grieving period? I'm fully aware that it's a time thing. Just want to do what I can to make it easier on her. I am hoping to get another pup (golden retriever) but they won't be ready until March.

What were your experiences with a pup that lost their companion?