Real Weight Gain or Water Retention?

Colleen is doing well this morning. She is amiable and drinking chocolate milk.
She gained a few ounces, but they are concerned it could be "water retention", rather than acutal weight gain. This water retention is one possible side effect. It would not be a good weight gain if it is water, and that may change a med she is supposed to get today.
Other than that, we are waiting on Dr. Chao to decide if she thinks it is real weight of water weight.
Dr. Chao was just here. She will decide if Colleen gets the Methotrexate today that is supposed to help her gain back her immunity. The scale they used this morning was different, so they want to re-weigh Colleen. That is important. All other factors indicate she should get the drug. No sign of "water" weight in any of her, ie: ankles not swollen, etc. They will postpone the med if it is water weight.
Mom (Susan)