My son is similar but now in gr 2. I think that the best way to 'teach' punctuation is to model it yourself. DS loves it if we read a page each and he still loves being read to, as well as reading himself. I don't want to make something he loves a chore so if he wants to read silently that is ok. You can always get her to read other things to you, shopping lists, recipes, instructions etc to practice reading out loud. Our biggest challenge has been finding age appropriate books to read...!