Aww poor Layla! Emma & Milli have both had allergies too, but not the watery eyes-just lots and lots of reverse sneezing which sounds way worse than it probably is. Both girls had it their first summers with us, but have been ok last summer. I think it depends on how much of what allergen is in the air. I hope the season is short where you are for Layla's sake
Can you give her Benadryl or Claritin? The Claritin worked for Milli and didn't make her sleepy like the Benadryl did. Just a thought...