no sudhi I wouldn't limit it to 45, but maybe no more than an hour and a half. you may well find that she is tired anyway and can't stay up the normal A time before night time bed.
I know it's hard, but when that happens again, I would wake her before 8am. say 7/7.30, that way she gets used to the routine. I did that this mroning. she woke at 4, coldn't get back down, so I fed her, asleep around5.30 I think, then up at 7. that way I can kind of keep her on track. you'll find she is tired from the nw anyway.
hth!!