baby feeding less on breast?

Nicola • My husband & I together 16yrs, married 5yr. Poppy born oct 2016, 4months off the pill, diagnosed reflux, breast fed baby
The last week or so I've noticed my LO hardly wanting to nurse when I offer (which is the times when she has always wanted). Today she's had less than 15 mins since 6am. Has anyone else noticed this and any ideas? 
I obviously know I can offer water (but her reflux makes her sick thatback up), I add more water or skirt a bit of my milk in her foods, I don't really want to express and see if she'll take it as we are in the middle of a kitchen refurb and have enough boxes and pots to wash in the bath, she's not unwell, we have today started a wonder week so whether it's that!