Should Protestants kneel at a Catholic Mass?

My MIL is protestant and visits often. She goes to Mass with our family on Sundays. During the consecration she does not kneel. I find that her attendance at Mass is a gift from Our Lord and that perhaps he is softening her heart to come home to Him. However, I feel distracted that she does not kneel before Our Lord. Should I be concerned with this or not?:confused:

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