So if the OP wants to get a place there, she has to 1. apply and 2. put her DD in a position, vis à vis the oversubscription criteria, that puts her 20 places above you as soon as possible (assuming that the list goes at least 1. LAC / PLAC, 2. Distance - she's got problems if there's something like 'Siblings' in between, of course).
@user1504044345 the point about applying from where you are currently is that it isn't fully relevant that at the moment there would be x applicants ahead of your DD. For schools admitting mainly on 1. and 2. above, then living 80 miles away when you apply will only get you a place straight away if there is a place at the time of application and no one else wants one. But once you are on the list, from wherever, you might find that a place comes up and yes, you're not at the top of it, but for various reasons, all those above turn the offer down. (And if distance is a major factor, then once you move to the area, you will go up the list). If you haven't formally applied, and a place goes to the person in the position you would have been in, and no further places come up this year, or at all, you've lost out.
'You've got to be in it to win it', as the saying goes.