I think it is wise to be wary of the claims of behavioral optometry in general and specifically with regards to this reported symptom.
Behavioral optometry, especially in the UK tends towards an approach unsupported, and sometimes contrary, to the best available evidence.
Lacking high quality evidence for practice is not uncommon in mainstream optometry but behavioral optometry tends to make grander and unusual claims.
I could provide many references for this but lacking a short one without a paywall I'll choose a recent one with a comprehensive abstract.
The OPs issue does not fit into an area where there is good reason to think behavioral optometry would be of benefit.
And I'm not certain that there is an issue to be addressed.
OP, your daughter's symptoms do not match any form of colour vision deficiency or ocular problem I can think of.
Given the occasional contrariness of our brain, added perhaps to the occasional contrariness of children I don't think you need to be looking into this right.
If the symptom is repeated, worsens or she complains of other problems, see your optician or go through your G.P. for a referral to your local eye department.