It sounds like another increase on the first A time could be due. Mine had a very long first A time but the rest of the day was shorter. I would add 10-15 mins and see if it makes a difference to how often she can transition past 45 mins even if it doesn't go longer than the 1hr 15 (and possibly increase again to see if she can go beyond the 1hr 15).
The second nap might need s bit of teaching to 'tell' her to sleep longer than 45 mins. A week or so of using a couple of rounds of W2S or staying in her room resettling her when she wakes may help to establish the habit of taking a longer nap. It depends if she has ever done a long second nap, if not it may be the habit, if she used to then it may be a little A time increase needed there too.
hth