I think the GSE does take a while. I would give it a little longer before going to the GV, especially if you're not having any other symptoms.
If you do the GV, I think blueberries would be fine. All you need is a little bit of GV on a cotton swab, put it in dd's mouth for a second to get it everywhere, take it out. You can even dip the cotton swab in water first (squeeze out the excess) to dilute it a little. I would probably do blueberries afterwards just so you can see what you're doing with the GV application.
HTH!
If you do the GV, I think blueberries would be fine. All you need is a little bit of GV on a cotton swab, put it in dd's mouth for a second to get it everywhere, take it out. You can even dip the cotton swab in water first (squeeze out the excess) to dilute it a little. I would probably do blueberries afterwards just so you can see what you're doing with the GV application.
HTH!