85 is a little low for the warm side imo, you want warm side 88-92 and cool side 78-82. You can make a hide out of a small card board box or anything. You want the hide to be snug when she balls up in it. So if your snake can ball up in the tub you should be able to make a hide to put in the tub. Also there should be a 1 hide on the warm side and 1 hide on the cool side. If you only use one hide she will always be in it and most likely wont regulate her body temp correctly. Also you need the 2 hides to be identical bc if there not she may chose the more secure one and not regulate temp properly. I always recommend the reptile basics hides bc that's what was recommended to me and my male now regulates his body temp and never was before. The hides I recommended are very dark inside and very secure, your snake would feel very comfortable in them.
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