No not really.
She couldn’t come visit on Shabbos. If she were already there, it may be different.
She couldn’t come Shabbos morning just to say hello. She couldn’t come Shabbos afternoon to play with her nieces. She couldn’t come over to see if my sister wanted to go for a walk at any point on Shabbos.
But yes, if she were there before Shabbos, my sister wouldn’t have to kick her out.