Help - don’t know what to do 🙈

So I’ve been nannying this little girl since she was born. So now 5 days a week I have my 8 month old and this 2 year old girl.

For a while I was able to get them on the same nap schedule for their first nap of the day. The older girl only takes one nap a day.

Well lately she has been sleeping with her parents in bed every night and for naps when she is with them during the day. It’s made a very difficult situation for me when I have her. She SCREAMS because she doesn’t want to go down to sleep alone. It’s simply not possible for me to lay down with her to sleep because I have my 8 month old that I can’t leave alone.

I’m sure it’s confusing for her because that’s how it is with her parents at home, but it simply can’t be this way when she’s with me. And if this happens while my 8 month old is already sleeping, she wakes up from the screaming.

It has become very stressful so I’m hoping for some advice!