Obviously you've heard something different... from their facebook page:
Hi all
Excellent News, Hsiao lan has given birth to a gorgeous baby girl, as you are aware many of our rescued primates have not had the benefit of being raised by their own mothers and as such they sometimes do not make the best mums themselves. Unfortunately this has been the case with regards to Hsaio lan, despite several attempts to unite mum & daughter, Hsaio lan is not interested. However, we have been incredibly lucky and fortunate. Hsaio Quai could see what was happening and has stepped in to take care of the baby. Jin is still feeding from mum, so milk does not seem to be a problem at the moment, but we are keeping a very close eye on everything.