People like this that have lots of money and own property.. my mom used to say, the reason they have all of this money is because they are tight with their money.
They purchase cheap or used because they would never pay retail.. They are willing to use these things so they assume so will her family.
Is her own living area filled with old or cheaply made items? Does she eat cheaply, not eat out, wears old clothing and does not purchase new clothes?
Again. all signs of a person that is tight with their money. Nothing wrong with this, because it is her choice.
Now IF she has other children and when they had babies purchased all new gifts.. you would know there was a problem.
Otherwise this is just who she is.
My mom grew up at the end of the depression. Her mom and dad always worked outside of the home. They have never had a lot of money.. at one point my mom and her siblings lived in the projects with their mom. My mother never had brand new clothes until she started working as a young teen. . They were used and donated clothing or my grandmother and great grandmother made their clothing.
My mother hates to pay retail.. she will go to the clearance section and shop. She adores garage sales. She purchases used clothing toys etc.. for the grandchildren.. Now she does a great job. Things are in almost new condition or bonus will have the labels still on them.. This did not bother me, but my sister was appalled. But she has always been a label snob..
Just place the items to the side. and if they are not safe, just throw them away..
The things from the dollar store can be donated or see if you can take them back. She actually sounds confused, bless her heart.. If she seems to be getting worse.. maybe mention to her son he take her to the doctor.
Is there any way you all can get your own place? Especially with a baby coming, not going to be fun for her, hearing that baby cry all night or all of that baby stuff allover the place.