Hopefully you didn't use too much Super Glue. That was stupid, but if you didn't use too much the damage shouldn't be too bad.
If you didn't use a lot, it's likely you can remove the old screen with little to no effort. However, it WILL get cracked during removal; there's no way around this. If you used a lot you're likely to inflict a fair amount of damage on the iPod and may damage other components removing the LCD assembly.
I'd honestly recommend just replacing the LCD shield in your iPod; removing the glue isn't going to be easy and you'll spend more time removing it then you will replacing the shield.
Once you remove the display, replace the midframe. Cleaning the glue from this part is not practical, since a used replacement that works is often cheap to purchase. A parts iPod will suffice for this if you need to go that route. As long as you can test the home button and see it works, you do not need to be picky about anything else. This is the part you now need: iPod touch (4th Gen) Midframe
After removing the midframe and LCD, check the components and flex cables inside for damage. If you see any and it's serious, I'd just replace the iPod for her and never do something so dumb ever again (if it's your fault).
Here's the parts you need: