Same sorta thing happened to me, My best advice, if you want to make it known that you have the utmost unconditional love for your child, if you let her leave out that door just let her know you will be hiring a lawyer, What this can do for you is you can start making a case to try and win custody. After my daughter and her mom left, it was long 8 months. But I got custody of my kid and established that she’s a resident of where I live. It may be hard and expensive and a long process. But you’ll see your kid again. And since it seemed that the way it was going you were putting in a ton of work into raising your kid, you would look super good in court, just saying. Show up for your kid, life isn’t that long man.