Maybe you need professional advice if you are uncertain as to how to interpret the regulations.
Yes, yours is a settlement visa, but NO you are not yet a 'settled' person, as you have not completed the whole process yet. Therefore, you cannot sponsor anyone for a UK visa.
Your husband can. He is the step-father to your daughter, and can therefore be her sponsor...as I was for my 2 Filipino stepchildren in 1996. (Don't need to be adopted).
I'm certainly not an expert on such things though, so I would urge you to search around on google, keep asking questions, and if time is getting tight...contact UKVI for up to date advice.