Aw hugs Tan, it's so hard!

Just a thought, but maybe Izzy is getting to the age where she is going to start pooing less. Lots of breastfed babies go WEEKS without pooing as they get older (she is totally BF isn't she?). What have her last couple of poos looked like? I think constipation is more about the consistency of their poo, rather than the freqeuncy. If her poo is a normal consistency, then I would say not to worry.

If you really think that she might be a bit constipated, then I would try giving her a little bit of cooled boiled water a couple of times and see if that helps.

Good luck hun!