To be a 44 bra she would have to be a BBW........so the 170 at 5"6 doesnt equate.I used to be a 44 band and was a UK size 24 and a damn site more than 170lbs.
The biggest i ever saw are my own....prior to my reduction...JJ and repulsively big.They are now a 40H/HH depending where i buy the bra from.
Away from my own i'd say 38G,an ex friend of mine who i havnt seen for years