Florist contract help

Hi weddit! Long time lurker, first time poster :)

We've found a florist who we love, who will also be doing our photography. She has a photography contract and has sent a floral proposal, which lists the date of our wedding and the flowers we discussed previously, the costs, and the due dates of payments. However, when I asked about a floral contract, she said the flowers we can continue to change as need be until close to the wedding. While it makes sense to me that the exact numbers and design, and therefore costs, would change until we have a final decision closer to the wedding, I would like something in writing that spells out the other details, like who is responsible for vases/containers, cancellation policies, what happens if she gets sick, etc.

I'm not worried about her flaking since she's also our photographer and we will have a contract for that. I mostly want the contract for logistical info like pick up and drop off times and payment schedules, little things I would likely forget and want to look back on. So I would theoretically be fine with waiting to sign a contract until closer to the wedding if we have a detailed proposal. But I do want to make sure we at least have an email saved with all of the important information.

So what would you make sure you have in writing? So far I have:

* Payment schedule * Drop-off time and who is responsible for set up/clean up * What happens if the vendor is ill on the day off * Cancellation policy * When the flower proposal needs to be finalized

What am I missing?