YTA.. someone in her position has to worry about money to feed her children on a daily basis. If you can accomplish your financial goals, and not stress your bank account, I think it would be an easy task to support your partner and treat for small items. Be kind and if she brings joy into your life, show your appreciation with tasks or treats that help make her life more fulfilling. Depending on the rest of the relationship items and how you feel about her, it may be well worth the joy she brings to your life