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Perhaps on the basis that she's been very frank, open and honest with them about it from the beginning, and having talked it through several times over a long history of her having these needs and desires, they've come to accept and understand that it is something she requires in order to remain that 'straight-A student' and 'competent adult'? Maybe it's an arrangement that they've come to after a long and painful process of the issue regularly spiralling out of hand, but now doing as they do is what keeps the matter managed and contained, and ensures their daughter keeps it 'just in the family' and continues to present a good and functional public face.
Also, perhaps her parents are very liberal and open-minded and permissive, with the general attitude that they should let their daughter choose her own path, and the recognition that her unconventional behaviours are at least harmless. Hence why she also feels so free to open up to them about what she wants.
Obviously, there is going to be a limit to the plausibility factor, no matter what! I can't see you ever finding this happening in the real world! The only other thing I can think of is if her mother and father were into diapers themselves, but that would seem to bring the wrong kind of creepy tone into it, I think! Perhaps if 'Mom and Dad' were more of a surrogate 'Mom and Dad' closer to her own age, and fellow ABDLs, who she'd found online and moved in with?
Hope that's useful, and feel free to PM me if it'd be useful to bounce ideas around some more!
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