A good clear macro photo would be helpful.
The wound needs to be cleaned properly before anything goes on it.
The fur around the wound should be clipped away by somebody comfortable using clippers.
Hibitane or similar type antibacterial scrub diluted in warm water and some gauze or a cloth to wash the area. Then a quick rinse.
Betadine(diluted iodine) can be used but may cause localized irritation..
Depending how deep the wound is it may need care, dressing, etc.
Please provide a photo or take her to a vet.
This was brought up in a topic you posted last week.
http://rabbitsonline.net/view_topic.php?id=69826&forum_id=48
Ithink they need to be separated. If you noticed issues were happening a week ago, this SHOULD NOT be allowed to continue. Please SERIOUSLY CONSIDER housing them seperatly and not allow them free time together.
Please separate your 2 rabbits.