DD had the same problem when she got her first full-time job and went from weekly to monthly pay. We didn't think twice about advancing her enough money to get through the month and she repaid us over a period of six months.
The alternative is that she has to take an unauthorised overdraft, might take out a pay day loan or resort to other borrowing to get her through the month that then gets her enmeshed in debt because of the horrendous interest rates, penalty charges and will damage her credit record.
Lend it to her and point out to your DH what the alternatives will be if you do not help her.
Stabbing at a school in Wales this lunchtime.
Last weekend, in Rutland, the first statue in Britain of the late Elizabeth II was unveiled.