I lost my female dog years ago. She ran off and I never found her. Even now I cry for her, as I never knew what happened to her, was she run over, was she found and loved by another family (I wish) I will never know. Not worth the riskTam a tracker sounds a brilliant idea for both you and Ela. It will definitely give you (and us) peace of mind. Having a dog go missing and not knowing what has become of them is horrendous and soul destroying.
Ela has had such an insecure start to her life there is no telling what miniscule scent, sight or sound could suddenly trigger what appears to us to be totally irrational behaviour.
All you can do is be even more patient, a dog that has grown up in a happy stable home can take months to settle if it has the misfortune of needing rehomed through no fault of it's own. Who amongst us can begin to understand what goes on in Ela's mind?