When lung tissue retains an excessive amount of fluid, this is called: ?

This is called pulmonary edema. The accumulation of fluid in the tissue and air spaces of the lungs can can occur either because of a failure of the left heart ventricle to completely remove blood from pulmonary circulation or because of an injury to the lung tissue. Pulmonary edema leads to impaired gas exchange and can result in respiratory failure.

Some of her  assignments would be creation of drugs. she is a medical chemist after all so she'd need to have the necessary knowledge to make medicine which can later be sold in a pharmacy