Help bird has disappeared

Hi, we have a pair of blackbirds in our garden, the Mam is sitting on her nest I reckon she’s on about day 7/8 of the incubation period. However the dad had not been seen for almost 2 days now. I think maybe the neighbours cat has had it. Should I put food out for the Mam so she can get something to eat or just leave her to do what ever she needs to do? Help please.