I hope it doesn't develop into something else and that you and your D get a break soon

It may be the infection shifting and settled lower into the chest, as long as she isn't struggling to breathe and is generally happy and alert I wouldn't get too concerned, but if any of that changes the get it checked out, DD1 has also had mucussy poo's and is inline with the onset of a similar cough.

DD1 ended up with a similar sounding cough called by her Paeds a 'Smokers cough' or 'Old Man's cough', it ended up lasting for months and she would then get infections over the top, in the end it was Asthma exacerbated by issues with her right lung.

Take care xxoo