I am so sorry for you and Soldi on the loss of your wonderful Ivy.
May I ask how you are acting around Soldi? If she hears, "Poor, poor baby" from you in a sorrowful voice, this may make her feel even more sad. If you always act like she is the best, happiest, luckiest dog in the world: "Come, Soldi baby! It's your favorite -- time for the beach!," talking to her in a very excited, happy tone, it may help a little over time. Of course it is not a magic cure for grief.
Eating. Diane Burpdog taught me that under certain circumstances, just give them what they will eat and don't try to push anything else, until they're eating more regularly. What has gotten several animals of mine to eat was lightly cooked beef or chicken.
Sending happy, upbeat cyberhugs to Soldi and gentle ones to you.