Hmmmm Male rabbits who are, shall we say, particularly happy to see you will make noises that sound not like grunting but like a low sort of humming sound and run around you. Not something I have ever seen or heard a female do. However maturing females who are starting to get hormonal will show some signs of their impending readiness to mate such as changes in behaviour (showing aggression, grunting, lunging and boxing with the front feet) and mounting other rabbits if they're kept together.
I would say that if you definately know it's definately a female (and double check because if the rabbit is starting to show that kind of interest it would be mature enough for it's bits to have dropped if it's a male) she is just starting to mature and is getting hormonal and showing her interest!
This is just your rabbits way of telling you she loves you. One of the many ways a rabbit communicates. They will also sometimes make the grunting noise if they are cornered before they attack.
Rabbits are such fun to have aren't they? It is really helpful when you know how they communicate check out the link below for some information on rabbits. Hope this helps!
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