Snow allergy during pregnancy

My sister is a pregnant lady. Presently she is staying with us in our house. She is allergic to snow. Once the snow starts falling, her eyes itch and sneeze repeatedly. This allergy started when she was pregnant for the first time. Although she consulted a lot of doctors nothing went effective. Since she is at home, I have to keep the house neat and clean always. I'm working women. So I don't always get time to clean the house and windows. I would like to hire window cleaning services ( ) for cleaning all the windows and the complete house. At times, she itself used to clean the windows. But once she does that the complete day she will be sneezing like anything. What has to be done in order to avoid the allergy to snow?

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