Follow-up: Will PRP be a successful treatment after pregnancy if it worked for me before?

In my opinion, the effectiveness of PRP postpartum depends upon  your concomitant androgenic alopecia and any other multifactorial causes. If you have shed a significant amount of hair, the ability to achieve the same density may or may not be diminished. Hard to predict. In my opinion, you can always add additional treatments to the PRP such as minoxidil, oral or topical, nutraceuticals, low level laser, finasteride or spironolactone to enhance the response. Find a PRP expert. Ask to see photos.

It may or may not. It really depends if the cause of your hair loss now is exactly the same as it was then. Over time, many women develop an increasing proportion of their hair loss from androgenetic alopecia. If your hair loss was 60 % due to telogen effluvium and 40 % AGA before but is now different than that ...you may find PRP has a different effectiveness overall. Be sure to see an expert. Some women do have an acceleration of androgenetic alopecia post partum.

Short answer - PRP would most likely be as beneficial as before. 
Nonetheless, get examined, maybe a few labs just to make sure your condition is not multi-factorial. A bit of Bio-identical  Hormone Replacement Therapy (BHRT) might just be a whole lot cheaper. I suggest you find a good Integrative or Functional Medicine physician that practices BHRT and go from there.
Get your hormones straightened out and then do a treatment or two of PRP to help push things along. Still much cheaper than a series of PRP hair regeneration treatments.
Hope I have helped. Wishing you the best outcome!
Warmly,
Arbella Sarkis, MD