Just as an FYI, the time at which an artist announces they are going to do a project, like the soap one, it generally means they had the idea a good time before that and now they can finally go ahead with it, whether it was they were waiting for the materials to arrive or hadn't figured out the logistics or were saving up the money to do the project, etc. As well, there is no rule that says that artists can't work on other projects while they work on yours, as long as they finish your project in the timeframe that you both explicitly agree on. I generally have about five different projects going at varying stages of completion at any given time, as some things get put on hold as I wait for paint to dry/I wait for supplies to arrive/I'm waiting for the client to approve the sketch/etc.

I do think a month is not a huge delay for a complex acrylic commission, and she has been responding to you with updates so I would give her a chance to get it done. If it's really bothering you, ask for a specific time that you can both agree to have it done by.