"Mid century modern" refers to design and style in the 50's (approximately). Think of 50's style furniture, architecture, etc. However,
quilts in the 50's were more along the lines of what we consider to be "traditional" today.
I'll bet what she's after is what we would call modern quilting. Clean lines, lots of empty space, etc. Here are some examples:
https://theplaidportico.com/2016/05/...andenburger-2/
https://www.13spools.com/blog/2014/0...oks-paper.html
https://londonmqg.wordpress.com/2012...susanne-woods/
Sometimes you can take a traditional pattern and make it "modern" by blowing it up huge, adding a lot of white space, or changing color placement from what we would traditionally use.
https://www.pinterest.com/pin/103231016434932150/
https://www.amyscreativeside.com/201...techno-flakes/
http://jehnnyandtheboys.blogspot.com...-finished.html
Maybe show these to your daughter and see if this is what she's envisioning? Hope this helps!