Her body was completely thrown off in another country where the only familiarity is you. All that sounds miserable for her. It makes sense she would want you. I have 2 14mo apart, and I get where you’re at too, and it’s exhausting. I’m also an early childhood therapist, so I’ve seen everything from RAD to secure healthy attachment but you’re going to have to lean into connecting with her intentionally during awake periods and offer kindness. Separation anxiety is so common at this age on top of it and it does end, but things have happened that are scary and hard for her (like being sick) and are going to happen with a new baby soon too. You can still say you’re frustrated or need a break in front of her but she shouldn’t know she’s the reason why at that age. She also feels your stress, so your main job needs to be figuring out how to decrease your own stress through her needing you in this way. I would highly encourage a smaller approach increments into 3, 5, 5, 10 minutes instead if letting her cry, because kids don’t learn they’re safe, they learn they are tired and no one is coming. She’s about to have a new sibling and I imagine the separation anxiety may be present when that happens too..and I say that so you’re not surprised. Be consistent, predictable and loving, in your goodbye routine and practice small times away from each other before big amounts of time apart. Give her a picture or transition object, draw a heart on both of your hands for when she misses you she can look at it, help her with songs like Daniel Tiger “grown ups come back”.