She is not eligible to pay fidya, as being pregnant and to breastfeed is not an incurable disease. She must make them up as soon as possible.

My wife couldn’t complete all fasts last Ramadan due to her pregnancy & still now many fasts are due. Now she is lactating & not able to complete pending fasts. 1- is it necessary to complete all fasts before next Ramadan or can she fast later (after completing fast of coming Ramadan)? 2-Is she eligible to pay Fidya instead of fasting (considering she is otherwise healthy)?

Fasting | March 30, 2017 4:38 pm
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My question is regarding seher timing,if we want to keep a voulantry fast and sehr is just optional when does the sehr time end?Does it end before the fajir time? Or much before ? I live in England and in the summer days seher time can be at 2 am while we pray fajir later on.