I was told that they look for 100-150g a week, but that any gain, even if its only 10g, as long as its consistent is okay.

Is bub generally settled? Does she have good skin tone? Is she generally alert? If yes, then I don't think you have anything to worry about. Trying feeding more frequently and offering the boob as a comforter. Are you using a dummy? If you are, maybe try and avoid it during the day and offer bub the breast instead.

But honestly, from your post, it sounds like you are doing a great job and everything is fine. Remember that everyone is different. MCHNs look for and average gain of 100-150g. Some bubs gain up to 300g in one week others a lot less. Unless there are other problems, this is all normal. HTH.