This sounds really horrible for you - I hope you can find a workable solution.
As for the new lady, don’t blame yourself. Even without a language barrier, it’s not always possible to get someone to do things your way. I’ve recently trained two people to do my job, too - the first one (we’re both in/from England) ended up being fired (the issue was his huge attitude problem, didn’t do anything properly because of that. I felt like I’d failed at first, then reminded myself this was a grown man, perfectly capable of following instructions, just didn’t want to). The second guy is working out much better, but I still had a headache from reminding him about doing things a certain way. At the end of the day, we can’t control what other people do, we can only control ourselves. I know it’s stressful when new (or otherwise) colleagues can’t/don’t want to perform in the ways we need, but you’ve done your best with her, so the rest is up to her.