It is well known that after storm comes sunshine. Referring to this, Allah Almighty says: (But lo! with hardship goeth ease. Lo! with hardship goeth ease.) (Ash-Sharh 94: 5-6) Islamically speaking, the wife is permitted to support her husband financially, especially when the husband finds it difficult to earn a living.
In this regard, the eminent Muslim scholar, Sheikh Yusuf Al-Qaradwi, states the following:

Originally, the husband is the bread-winner of the family. He is supposed to maintain the wife and cater for her needs, even if his wife is a millionaire. Referring to this, Allah Almighty says: (Men are in charge of women, because Allah hath made the one of them to excel the other, and because they spend of their property (for the support of women)…) (An-Nisa’ 4: 34)
Thus, the husband is supposed to pay the mahr (dower) and shoulder the family expenditures as long as he is financially able. However, if the husband is very poor and has no means to maintain his wife, then there is nothing wrong if the wife assists him in this regard. This ruling is maintained by some Muslim jurists, who quoted this Qur’anic evidence in support of their view. Allah Almighty says: (…And they (women) have rights similar to those (of men) over them in kindness…) (Al-Baqarah 2: 228)