Emergency admission

You are a physician in Neurology Emergency Room (ER) and you have been called in to take over the shift earlier because your colleague has suddenly fallen seriously ill.
As they try to convey the most important information to you, they mention:

"And then there's one more patient in the waiting room, probably with myasthenia, but I can't recall their name at all…"

Uncertain and without the patient's name, you return to the Neurological ER, where four patients are now seated. After examining, questioning, and assessing each of them, you realize two things:
1. There are multiple patients in the waiting room with suspected myasthenia gravis, but none of them requires your immediate attention.
2. However, among them is one patient with a different diagnosis that demands urgent intervention.

Which of these patients is most likely NOT suffering from myasthenia gravis?

Mrs. Nožičková (51 years old) complains of gradually worsening weakness in her lower limbs. Yesterday, she even fell during an ordinary walk. Upon arrival, her gait appears relatively normal. However, during the examination, she is unable to keep her legs raised for more than a few seconds due to fatigue. She is also unable to perform a squat. On further questioning, she reports weakness in her upper limbs during everyday activities, such as washing her hair.

Mrs. Sovová (45 years old) complains of double vision, particularly in the evening while watching television.
The symptoms have been present for approximately two weeks. Upon examination, you observe an asymmetrical drooping of the left eyelid, which becomes more pronounced during the assessment.

Mr. Mlčoch (61 years old) complains of intermittent speech difficulties. During the examination, he initially communicates clearly, but after a longer conversation his articulation becomes slurred, and he gradually becomes harder to understand. He speaks more slowly, seemimgly strenuously and less clearly.

Mrs. Kvapilová (71 years old) responds slowly and with difficulty during the examination. She attempts to answer but produces only single words or garbled expressions that make little sense. Comprehension appears to be relatively well preserved—she responds appropriately to simple instructions. When elevating the limbs, a gradual drop of the right upper and lower limb is observed. There is also decreased sensation on the right side of the body.