You should be fine. I've used stuff that strong on my girlies from the same line before, and for longer, and at full dilution.
So you ended up with like 5-27-3... next time boost up the last number to like 5 or more and get the middle one down a smidge, like 15-20, and I think a rule of thumb for Nitrogen is no more than half what you were using in veg. I mean, seriously, diff strains are diff feeders so if you play proportions... like if you could give them N=10 in veg and not burn them you didn't do a bit of damage with the 5.
Sounds like the sitter bought bulb bloom food, lol!