Green poop and milk supply

Hi, the last couple of days my baby has had greenish poop, sometimes quite bright green even. Otherwise she is very healthy and doesn't seem sick at all.

I've just done a quick look on the net and I found info that it can be related to a milk supply problem - an imbalance between foremilk and hindmilk. That she may be getting to much foremilk (high volume low calorie) and not enough of the full fat hindmilk.

A recommendation was to fully empty a breast at a feed instead of switching to the other side if you are going to offer the other side, or if the breast hasn't been emptied at one feed then start the next feed on the same side to ensure it will get emptied. Even if it means expressing and wasting a little bit of milk on the other side to stop engorgement and mastitis until supply settles down.

My question, which may sound a bit basic, is how do I know when baby has emptied milk from one breast? Will she stop feeding automatically, because sometimes it seems as though she's just using the breast as a pacifier towards the end of a feed and it's hard to tell how much, if any, milk she is getting. Occasionally when she pulls away I squeeze the nipple/areola to see if there is any more milk and usually there is. Other than checking myself I was wondering if I would know when she is finished.

Sometimes she pulls away after 10 or 15 mins but I'm not sure if she had drained that side or just having a break, but after she has pulled away I offer the other side which she usually takes, and I think that may be where my problem is, that she hasn't finished with the hindmilk on the first breast yet and I'm switching sides.

Has anyone else encountered a problem like this? Thanks

You can't really completly empty a breast, because milk is being made all the time so you should be able to still squeaze a few drops out at the end.
When Jody was younger I got confused about when she was finished. I would let her get to the point where she would do butterfly sucks (sorta quivers her chin), then let her go for a little bit longer just to be sure. Then take her off.
She very rarely takes both sides, and I don't think she ever did before my supply dropped a bit at 3 months.

I only ever feed off one side. Unless DS is really hungry which is usually int he evenings he'll have both.

Thanks for all your replies.
Yesterday I started feeding from just the one side again and the poos are changing colour back to normal again, still not 100% right but getting close. For some reason she did some longer feeds than usual on the one side, not sure why, and was very content after so that made it easier.
I see my MW today for my final discharge appointment so will mention it to her.