You are overcomplicating and overthinking. If all her docs have one name, that is her name. If she used another name before, or even now sometimes, put that under 'other names.'
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Sorry dear...actually i am worried about this issue. All my docs and certificate it is written One name. Even in PR application i wrote the name as per my passport. Okay let me make you more clear. Actually, in MY NID my mom name is different with my Mom's NID. Hope u got my point. What will happen if i wrote my mothers name as per my passport? Just want to avoid this issue...