Is there any dangers with soaking in a foot of very warm water with added 150 lb of epsom salt?

Epsom salt is just magnesium sulfate. I use it for sore muscles in my bath but only a few cups per tub of water. It is not likely that she will absorb enough systemically to hurt her. If she is in a long time or the water is too hot or she doesnt rinse the salt off it can dry the skin. There are a lot of benefits to soaking in Epsom salts (Magnesium sulfate) It can help to soften skin when taking a brief soak as long as the water is not too hot. It can help psoriasis and eczema. Some say it can help with wrinkles. One should rinse well and pat dry and apply emollients right after bathing. Some say Epsom salts can help to detoxify the body. Despite the benefits, Epsom salt baths aren't for everyone. They generally aren't recommended for people who have conditions such as heart problems, high blood pressure or diabetes. If you aren't sure whether an Epsom salt bath is safe for you, consult your doctor first. You can also google the Epsom Salt Counsel for more information.

The bags of epsom salt should have instructions for soaking on them. If you ingest anything that could increase you to have a bowel movement than the medicine is effected because if its in the toilette its not in your stomach absorbing into your blood stream. Lol :). Gotta laugh in life.