By deciding to not text them, you're still letting your WW have power over you. Forget that she asked you to text them. Instead ask if you care enough about them to wish them well. In the end, it's just a text and won't cost you anything.
Me-47,XW-43 S13,S16 M:18 BD:4-23-17 W filed:7-17-17 (5 months of in-house separation hell) W moved out:1-6-18 D granted:2-15-18 Decree signed:3-29-18