Try Angel Maternity - they have an eveningwear/special event range of maternity dresses... This one
is a "nursing dress" & they have it in a few different colours.
I'm also short @ 160cm/5ft4 & curvy, & find that quite a few of the Angel Maternity styles suit me - it's my favourite maternity brand
. I haven't tried this particular dress, though. Some of the crossover style dresses may also be suitable, even though they're not specifically listed as "nursing" dresses.
Stockists are listed on the website & they also have an "outlet" style store in Castle Hill. I'd highly recommend trying the dress on to see how it fits. I bought a dress online from them that I expected I'd be an L (going by the measurements on their sizing chart), but had to take it back & swap it - for an XS! (& I have a 14DD bust, so don't consider myself to be "small").