I would be very surprised if your rosy was gravid for 3 reasons:

1. She is a bit young & if you have an even younger male in there he might not be ready to go yet either.

2. You would have noticed copulation as it happens multiple times a day over as much as several months.

3. It's the wrong time of year.

It's probably just their natural tendency to not feed during the winter months.
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Thanks,
-JC
rosyboas.to

1.1 San felipe (CB'93)
0.1 ghost San felipe (CB'98)
1.0 ghost San felipe (CB'03)
0.1 het ghost San felipe (CB'04)
1.0 ghost-line San felipe (CB'98)
1.1 hypo Borrego (CB'99)
1.1 albino Whitewater (CB'02)
1.1 double het for snow (CB'95)
1.0 snow rosy (CB'04)
1.1 Joshua Tree (CB'96)
1.0 Bagdad (CB'99)
1.1 Harquahala Mts. (CB'04)
1.1 Temecula albino (CB'02)
0.1 Temecula albino (CB'05)
1.1 Hemet anery (CB'05)
0.1 Boa constrictor (CB'92)