I think you are very generous to want to give a special token to the parents from their child. Regardless of wether babies craft or there will be time or expenses. People's negativity is so thoughtless. She's being NICE.
OP I work with infants and we do a lot of crafts for them. Pictures in homemade frames, foot/hand prints with a nice poem or saying (google search usually finds some no problem) celebrate daily milestones great nap today, hungry at lunch, lots of smiles today. Parents love to see those small things. Anything you do will be greatly appreciated. My sister gets a daily report from daycare she loves it. It's amazing what you can make with a sheet of construction paper markers and a glue stick. These small tokens take minutes to complete but will be meaningful to the parents. They will know they left their heart with a caring person.