Church Renewal is not easy. Especially when you have a dear old saint who is willing to take the church to the grave with her.
What you can do is research the changing Demographics. Get to know the previous demographics during "her day" and learn how they have change. This research can be acquired through your association if you do not know how to do it. The reports you get from them will give you a wife swoth of info to include conservative or liberal, religious affiliation, churched and unchurches, family homes or singles, etc. Usually you can stick to just a 5 mile radius.
Be able to show the demographics and how they have changed. Show that what worked back in her day will no longer work because of the changing of demographics and the mindsets of people that have moved in the area, say in the last 10 years. I guarantee there has been some amount of change.
Also, you need to show why the church needs to be reaching people of all ages including young families which will be where the energy comes from if the church is to continue and move forward.
It may also be necessary to use scripture to define "what works" in a church. To some of our seasoned saints "what works" can often be code word to hide behind that simply means "I'm only comfortable with this".
You do not want to be pushy to the point that you create a mess. However, at some point the church needs to decide if keeping those dear old saints are worth holding the church back.
Here is a link to some podcasts about church renewal. These are not calvinist oriented so my may have to take in what you will and spit out the bones.
http://renovateconference.org/podcast
If you truly have a heart to see your church grow you can get locked in with your association and they will help you in any way they can. Maybe you can be the catalyst for that church to move forward for God's glory. I will be in prayer for you in your endeavor.