some lactation consultants are hopeless when it comes to low milk supply and seem to believe it is simply a baby problem (ie poor latch, not feeding often enough) and that all moms have enough milk.
with baby #1 i had limited success with fenugreek (it was important for me to get a high enough dose - check
www.kellymom.com for dosing info - else it is useless) and domperidone. he was also formula supplemented. i was told i couldn't take metformin again during nursing.
baby #2 i had much better success with metformin and domperidone. i couldn't take fenugreek since it made her super, super gassy to the point of colic.
metformin worked really well with me while nursing - some sources say not to take it together with goat's rue since they are similar and may cause very low blood sugars in mama. dd was exclusively breastfeed with no supplementing except that it took a lot of work, breast compressions, and dedication. she was nursing every 2-3 hours around the clock (even after introducing solids) until she stopped nursing.
some notes of optimism for your mom: breast tissue and milk supply can increase from one baby to the next. it seems to with me. there is also a good book out called "making more milk" and she has quite a section on low milk supply and PCOS. i also have a SIL who had one preemie baby and she found it took quite a while (i believe weeks) for her milk supply to fully develop, even though she has no other health issues. her baby wasn't strong enough to fully drink milk and the pump doesn't fully cut for bringing on the milk supply, kwim? once her baby got older and better able to nurse, things greatly improved.
I hope her supply increases
