However, Wellington captain Rebecca Burns carried her bat through with an unbeaten 53 as her team reached 100/2 after 11 overs.
The Central batters were much more switched on in the afternoon against Otago, racking up 149/7 to set up a 20-run win.
Watkin was promoted to opener and made 12 from 17 balls before being judged lbw.
This time, Central had a key top order partnership as Manawatu's Mikaela Greig made an excellent 64 from 37 balls, supported by Taranaki's Melanie MeGaw (31 from 22).
Watkin then had an excellent four over spell with her spinners, getting two key top order wickets for miserly figures of 2-13 as Otago were restricted to 129/7.
Greig gave good support with 2-34 from her four overs to complete a fine match.