I think the safest way to make changes in insulin dosing is in small increments and allowing at least a few days at each change level. If you used an IC ratio of 1:14 today, perhaps you should use the same breakfast content and size and dose the same 1:14 IC ratio tomorrow. I know that it might seem like you're taking too small steps but there may be another factor that influenced today's breakfast dose that you're unaware of.
What type of insulin are you using? How long does this insulin last? I have found that my insulin last about 4 1/2 hours, a duration that I suspect is longer than many other diabetics.
The reason that I think you should take such small steps in adjusting your dose is because you're dealing with a diabetic that does not weigh much.
What was your daughter's BG before breakfast? How much time before breakfast was the insulin delivered?
I am curious how this plays out for you and your daughter. Please post updates!