help sexing

Female. Could we get a picture of the actual spider too?

@MrGhostMantis

The spider, not the molt.

@MrGhostMantis sorry,
Here's a link to a picture https://drive.google.com/file/d/1EpL5RwQ9uvDq-oeR7uUysvWsVat2nYLw/view?usp=drivesdk

Could you just post a picture on here please. I can’t access this at the moment as my google acc. is down.

@MrGhostMantis

I recommend giving this little one a few good meals. Looks like a Vagans to me.

@MrGhostMantis she'd been refusing meals when that picture was taken. I don't have a good picture of recently, but she's started eating and plumping up some

I'm not wholly convinced those are spermathecae if I'm being honest... the image isn't clear enough for me to be certain though. It's a little too low quality. If you run a pin down the center of the molt between those two darker dots, does it catch on a small flap-like formation? or does it appear to be smooth?

Those are male organs and not spermathecae. There are a few things that set them apart.
Firstly, male organs can be very dark - far too dark to be spermathecae at the smaller sizes. Female spermathecae would still be transparent, or light pink, at this size and wouldn't be sclerotized for some time yet.
Secondly, they are almost completely round and spaced far apart.
Thirdly, there is no evidence at all of a uterus externus.
In addition, you can also see the white half moon of the epiandrous fusillae in this photo - it will be very obvious on ventral shots of this individual. This is definitely male.
Checking other photos of Brachypelma spermathecae illustrates that their spermathecae look nothing like the male organs - they are fused together for the most part. The only genus, that I have encountered, that is more difficult to determine male from female organs is Thrixopelma - especially at the smaller sizes. Male and female organs look very similar, since females can mature at smaller sizes and they have a smaller than average uterus externus.