Wa alikum salaam Urwa,
A wife can work outside as per Islamic regulations that she adheres to the guidelines.
If the couple had already discussed and decided what to do about her working and he has already given permission, then wallahi aulum, then there is no need to get permission each time.
Also the husband should consider being merciful to the wife and if she finds it difficult to do such unnecessary things as asking permission everyday,which she has already gotten his permission for,he must help her ease her hardships.
I do think it is between the couple to decide ,for example, if I were going out,my husband would know, not because he would say yes or no,but it has become part of our lives to let each other know when we are going out.It is like saying "bye" as I am leaving.
If I was going out, especially other than normal routine,then I would definitely let him know.
Regarding going to mosque five times a day, this is actually not a requirement for women,alhamdlillah, as it is rather hard on us to do this everyday.As many of the women take care of the household whether working or not .
Especially harder with children around, whom we could have with us while praying at home as they will be in their familiar space and would stay calmer than taking them to the mosque and trying to pray there.
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