It is not allowable for a woman to keep (voluntary) fast when her husband is present without his permission, and she may not allow anyone to enter his house without his permission.  

قَالَ رَسُولُ اللَّهِ ﷺ لاَ تَصُومُ الْمَرْأَةُ وَبَعْلُهَا شَاهِدٌ إِلاَّ بِإِذْنِهِ غَيْرَ رَمَضَانَ وَلاَ تَأْذَنُ فِي بَيْتِهِ وَهُوَ شَاهِدٌ إِلاَّ بِإِذْنِهِ  

A woman came to the Prophet ﷺ while we were with him. She said: Messenger of Allah, my husband, Safwan ibn al-Mu'attal, beats me when I pray, and makes me break my fast when I keep a fast, and he does not offer the dawn prayer until the sun rises. He asked Safwan, who was present, about what she had said. He replied: Messenger of Allah, as for her statement "he beats me when I pray", she recites two surahs (during prayer) and I have prohibited her (to do so). He (the Prophet) said: If one surah is recited (during prayer), that is sufficient for the people. (Safwan continued:) As regards her saying "he makes me break my fast," she dotes on fasting; I am a young man, I cannot restrain myself. The Messenger of Allah ﷺ said on that day: A woman should not fast except with the permission of her husband. (Safwan said:) As for her statement that I do not pray until the sun rises, we are a people belonging to a class, and that (our profession of supplying water) is already known about us. We do not awake until the sun rises. He said: When you awake, offer your prayer.  

جَاءَتِ امْرَأَةٌ إِلَى النَّبِيِّ ﷺ وَنَحْنُ عِنْدَهُ فَقَالَتْ يَا رَسُولَ اللَّهِ إِنَّ زَوْجِي صَفْوَانَ بْنَ الْمُعَطَّلِ يَضْرِبُنِي إِذَا صَلَّيْتُ وَيُفَطِّرُنِي إِذَا صُمْتُ وَلاَ يُصَلِّي صَلاَةَ الْفَجْرِ حَتَّى تَطْلُعَ الشَّمْسُ قَالَ وَصَفْوَانُ عِنْدَهُ قَالَ فَسَأَلَهُ عَمَّا قَالَتْ فَقَالَ يَا رَسُولَ اللَّهِ أَمَّا قَوْلُهَا يَضْرِبُنِي إِذَا صَلَّيْتُ فَإِنَّهَا تَقْرَأُ بِسُورَتَيْنِ وَقَدْ نَهَيْتُهَا قَالَ فَقَالَ لَوْ كَانَتْ سُورَةً وَاحِدَةً لَكَفَتِ النَّاسَ وَأَمَّا قَوْلُهَا يُفَطِّرُنِي فَإِنَّهَا تَنْطَلِقُ فَتَصُومُ وَأَنَا رَجُلٌ شَابٌّ فَلاَ أَصْبِرُ فَقَالَ رَسُولُ اللَّهِ ﷺ يَوْمَئِذٍ لاَ تَصُومُ امْرَأَةٌ إِلاَّ بِإِذْنِ زَوْجِهَا وَأَمَّا قَوْلُهَا إِنِّي لاَ أُصَلِّي حَتَّى تَطْلُعَ الشَّمْسُ فَإِنَّا أَهْلُ بَيْتٍ قَدْ عُرِفَ لَنَا ذَاكَ لاَ نَكَادُ نَسْتَيْقِظُ حَتَّى تَطْلُعَ الشَّمْسُ قَالَ فَإِذَا اسْتَيْقَظْتَ فَصَلِّ