1250 cals/day -- no weight loss?

SideSteel

1) Possibly just significant fluid retention masking fat loss.
2) Most people eat more than they think for a variety of reasons. That being said if you really ARE eating at 1250 I would expect you to start losing at some point soon and I would also expect you to be able to eat slightly more and still lose at a reasonable pace.
3) 140g protein is probably more than sufficient but I wouldn't be concerned about safety provided you don't have pre-existing conditions that would prevent you from eating a protein rich diet.