The Nymph's appraisal results weren't weak, but if her children were this strong, it served to reason she should have been much stronger than she currently was.
I scanned the banquet to find the Veladrys the Nymph had sent to assist Typhon. She wasn't weak at all, with her appraisal results also being quite high.
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LV25 Verum Veladrys
Specie: Ailith Fae
HP: 290/290 Defence : 245
MP: 370/370 Intellect: 260
SP: 175/175 Magic: 340
Attack: 325 Agility: 335
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This was also true for the rest of the Veladrys gathered around my nestlings.
The Veladrys weren't much of a threat to us because they were friendlier after fighting with my nestlings in battle, and they were under the command of the Nymph, who seemed to want to befriend me – although she had a strange way of showing it.