can i share a little something with you op? we live in canada, a bilingual country no less
and my dcs are 11,9, and 7. their school does not have french, despite most other schools having french lessons, or a french immersion programme (it is, to be fair, the language that you need for business etc in certain areas of the country).
so i am in a bilingual country in a school that doesn't offer french. go figure. 
in fact, we are due to move soon, and no longer have the option of french immersion, because my children have not been in a french programme. in a bilingual country.
but at least the kids will actually have a french lesson or two, come fall.
please tell me you aren't going to carry on with this nonsense.
do your utmost to get your dc into a better school. but puh-lease don't continue with the french as necessity thing. you will be a laughing stock. and everyone will know you are just pulling that card because the school she has been allocated isn't as good as the others.
the dc have also spent time in a school where there were approx 30 different languages spoken by the pupils, with the large majority having no english at all on entry (and entry being at all points from yr r through to yr 6). the tefl programme was exceptional, and all pupils were, if not fluent, reasonably functional in english at the end of the year. real value added.
sending your child to a school with a once a week french lesson taught by a maths professional with a durham accent, is NOT going to add value to your child's education at all. not a jot.
being in that school might - so i can see why you want to get in, tbh. but it ain't because of the french lessons.
you'd get more sympathy if you started a thread saying 'oh no - been allocated a failing school' and asked for help with that. and left out the ridiculous language nonsense completely.
legal route indeed.