Looks like you are taking the lead in getting the SA in place to protect your finances and daughter. Perhaps write down your own list of non-neogtiables (i.e. time with daughter, funding goes toward for what purpose and discuss it with L to see if they can be enforced.
Since W is apparently continuing the affair, you might want to consider implementing the no contact approach. W needs to get a taste of what life would be like if she were to proceed with D.
