With a normal interior design project that is professionally executed the planning and ordering process can take anywhere from months to years, depending on the size of the project. The install portion usually takes about week, give or take, again depending on the size of the job. If a designer is being adequately compensated they have included in the budget the cost to hire whatever staff they need to help them execute the install - assistants, moving crews, handymen, cleaners etc.
All I can figure is that she takes on these projects either for free or is paid very little to do them. Hence, can’t afford to pay helpers. As far as the expedited timelines, some of her projects seem to me like maybe the client wasn’t even planning on hiring a designer but Crystal pitched it to them - as in, hey, let me help you out with some styling in exchange for a place to stay for a little while, or letting me film it for content, etc. Her last minute shopping sprees the day before or morning of tells me she either is a really shit planner or she has no place to store the product she is going to be installing so doesn’t purchase in advance. Again, highly unprofessional and speaks to a lack of funding. On actual design projects you couldn’t get away with that because you would be expected to order the furnishings/accessories/window coverings/art/lamps/rugs well in advance and have them waiting to go in during the install. You would never just wing it and wait and see what Ikea or the hardware store has in stock.