She can do it simply as supplication.

It is not permissible to be prayed by another person.

Please how can a person who is impure from major impurity such as menstruation perform the salatul istikharah if the decision cannot wait till after she’s pure or can another person do it on her behalf?

Prayer | October 10, 2015 3:01 am
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At time of isha prayer, dinner is served, but a person or two is not hungry and wants to pray first, also the wife wants to come along with the husband to the masjid. Is it correct if they pray first then come and eat or was it wrong for them to leave dinner which served and go pray, also if the wife wants to come to the masjid with the husband, can she be refused to come to the masjid?