Women's Twenty20 Bowling in Each Season by Morna Nielsen
| Season | | Balls | Mdns | Runs | Wkts | BB | Ave | 4wI | 5wI | SRate | Econ |
| 2007-08 | (New Zealand) | 12 | 0 | 16 | 0 | | | | | | 8.00 |
| 2008-09 | (New Zealand) | 12 | 0 | 15 | 1 | 1-15 | 15.00 | 0 | 0 | 12.00 | 7.50 |
| 2009-10 | (New Zealand) | 90 | 0 | 97 | 4 | 3-30 | 24.25 | 0 | 0 | 22.50 | 6.46 |
| 2010-11 | (New Zealand) | 216 | 1 | 227 | 8 | 2-21 | 28.37 | 0 | 0 | 27.00 | 6.30 |
| 2011-12 | (New Zealand) | 240 | 4 | 192 | 11 | 4-10 | 17.45 | 1 | 0 | 21.81 | 4.80 |
| 2011-12 | (Australia) | 72 | 0 | 72 | 3 | 2-25 | 24.00 | 0 | 0 | 24.00 | 6.00 |
| 2012-13 | (Sri Lanka) | 72 | 1 | 65 | 3 | 2-10 | 21.66 | 0 | 0 | 24.00 | 5.41 |
| 2012-13 | (Australia) | 48 | 0 | 34 | 3 | 2-25 | 11.33 | 0 | 0 | 16.00 | 4.25 |
| 2012-13 | (New Zealand) | 72 | 1 | 55 | 2 | 1-7 | 27.50 | 0 | 0 | 36.00 | 4.58 |
| 2013-14 | (New Zealand) | 144 | 1 | 112 | 5 | 2-8 | 22.40 | 0 | 0 | 28.80 | 4.66 |
| 2013-14 | (West Indies) | 90 | 0 | 85 | 2 | 2-24 | 42.50 | 0 | 0 | 45.00 | 5.66 |
| 2013-14 | (Bangladesh) | 114 | 0 | 90 | 5 | 2-23 | 18.00 | 0 | 0 | 22.80 | 4.73 |
| 2014-15 | (New Zealand) | 204 | 3 | 152 | 9 | 3-20 | 16.88 | 0 | 0 | 22.66 | 4.47 |
| 2014-15 | (West Indies) | 72 | 1 | 49 | 4 | 3-10 | 12.25 | 0 | 0 | 18.00 | 4.08 |
| 2015 | (India) | 41 | 0 | 55 | 4 | 3-30 | 13.75 | 0 | 0 | 10.25 | 8.04 |
| 2015-16 | (New Zealand) | 210 | 1 | 150 | 6 | 2-12 | 25.00 | 0 | 0 | 35.00 | 4.28 |
| 2015-16 | (Australia) | 228 | 1 | 198 | 18 | 3-12 | 11.00 | 0 | 0 | 12.66 | 5.21 |
| 2015-16 | (India) | 120 | 0 | 65 | 3 | 1-13 | 21.66 | 0 | 0 | 40.00 | 3.25 |
| 2016 | (England) | 137 | 1 | 111 | 5 | 2-16 | 22.20 | 0 | 0 | 27.40 | 4.86 |
| 2016-17 | (Australia) | 230 | 0 | 245 | 6 | 3-19 | 40.83 | 0 | 0 | 38.33 | 6.39 |
| 2016-17 | (New Zealand) | 48 | 1 | 41 | 1 | 1-14 | 41.00 | 0 | 0 | 48.00 | 5.12 |
| 2017-18 | (New Zealand) | | 0 | 0 | 0 | | | | | | 0.00 |