I understand everybodies sentiments about teachers doing their jobs, but schools do make rules regarding dress to make their lives easier. nowadays if you send your kids to school with rubber boots (remember those?) she’ll stay with them all day. So parents adapt and get different boots.
Practically speaking, there used to be spiral type laces that just need to be twisted and don’t come undone so easily. They’re probably still around. Check at your shoe repair and distribute to students if needed.
And kids are home more than you think, so mothers get enough “practice” tying shoelaces. If she’s frustrated enough she’ll probably get shoes with straps for the tot’s next pair. But that’ll be for the next school year…
I mostly baffled by your statement that fifth graders can’t tie their laces. If that’s true they probably always had velcro… Seriously, get the first grade or pre-1-a teacher to teach tying laces if this is a skill many kids are lacking.