Preggo Planner

I think you can just politely ask her what her maternity leave is going to look like, and if you should direct questions to her partner.

I agree with the previous post.

All about presentation- as the previous person mentioned, ask her what her maternity leave is looking like.

Just want to give my experience. My DOC gave birth about a month and a half before my wedding. Before me asking anything, she had already decided to bring in another person with her to help her out the day of in case she was too tired. I didn’t have to worry because she had already thought of what she’d need since she was a new mom.
If you’ve been working this long with your planner, it sounds like you know that they’re a professional and that they’ve probably already thought about this.
I would try not to worry too much and expect that she does have a Plan B but it’s also a great idea to go ahead and ask her nicely like previous commenters have said.Communication is always key!

A nice inquiry, without any assumptions she cannot do it, is nice. It says you are open to change, which freaks some people out.
I was unhappy in late stages of pregnancy when several important people just assumed I would not come back after 2 weeks, or that I could not handle my stress and sleep and such, and to be nice, found someone who could take it over. When in fact I had been turning away half of usual clients who would need my services in the first six months, and all with heavy lifting or kid incompatible schedules, not taking the work to start with rather than discontinue, and instead taking half as much new work total, and mostly short flexible things. So it was somewhat upsetting at 7 months in terms of income, having cut 2/3 of my client time and half my income for months, to have half of what I carefully kept , nicely make other arrangements. And any who mentioned anything all along the line, I told. Most professionals should start coverage issues a ways out. And March is a fairly low business month for weddings. I hope she simply reassures you that she appreciates your consideration, but only has a few weddings in the month. The person you have shared things with is the one you want, if possible.