Screaming 17 month old..

I’m babysitting for a good friend of mine. She has 2 step daughters age 4 and 5 and a biological daughter age 17 months. They just moved into a new house last week and we think her youngest isn’t settling in well. All she does as soon as her mom leaves is scream. Like literally scream non stop for hours at a time. Nothing I do consoles her and she wants nothing to do with me. If I pick her up she screams harder, which isn’t like her. At their old house she’d come to me for comfort and want to snuggle when she was crying. Now it’s as if she hates me. What can I do? I’m here with her for another 8 hours and I can’t get her to stop screaming. She screamed all day yesterday too with no way to console her. I’m 27 weeks 3 days pregnant with my first and my hormones have me being really temperamental and easily irritated. This constant screaming makes me want to cry too. Any advice would be appreciated. Not even her mother knows what to do besides just let her cry