While the tub or tank isn’t ideal by any means, I think she’ll be fine until you can get another setup. Worst case scenario, you can let her out for regular exercise until that happens. If you are somewhat handy, you could also try building a cage. Melamine comes in 8’ x 4’ sheets at Home Depot and they will usually make the big cuts for you. Melamine is heavy, but strong when screwed together and waterproof on the surface...you just need to seal the seams very well. I used homemade melamine cages for a number of years. They weren’t always beautiful, but they were fuctional.