Fluid under skin bright kidneys 13 weeks

Ok so this is about my niece or nephew. Not mine.

My sister in law who I am extremely close with went for her Nuchal Translucency scan at 13 weeks almost 2 weeks ago. I went with her. There was no thickening or fluid on the back on the neck.

However the doctors are concerned because because there is fluid under the skin. (Arms back etc). There is none on the back of the neck or brain though. The kidneys were also bright.

They said this can be anything from nothing to a fatal abnormality.

Moving forward she decided not to have the CVS (it would have to be done that day), she got a panorama blood kit done (although they said they didn’t get enough not sure if it was not enough blood or not enough of baby’s dna), she has another ultrasound in 2 days and if anything comes back abnormal she may get an amniocentesis.

She has a lot of faith and would never terminate. She just wants to be prepared and do what is best for baby if there is a way to intervene.

Another side note: sister in law is high risk due to having diabetes since high school. She has had a successful pregnancy other than pre-eclampsia, induced at 37 weeks, emergency c section, and short NICU stay due to sugar levels.

Has anybody experienced this before? I would like to know any and all outcomes. Please do not sugar coat. I appreciate your time and help in the matter in advance.

Prayers, thoughts, and good vibes are also greatly appreciated.