I've been having this problem this morning as well, bubs usually does a bit of a dance when I have breakfast but didn't this morning. However sitting here at the computer, I just put my hands on either side of my belly and gave it a really good wriggle side to side. Bubs seems to be asleep as I got one lazy movement on the side (probably moving her leg) and then not much more.
The same thing happened yesterday morning and all yesterday afternoon she wriggled and let me know she was there.
See if that works with your sister, otherwise get her to call her caregiver if she is really worried.
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