Do you have siblings? Third house is about siblings as well. I have a friend with Neptune in 3th and she felt the 'losses' and sacrifices in regard to her sister for whom she needed to care and be responsible for from the early age. She 'lost' her childhood curiosity and explorations because she needed to take care of the sister - and it took her many years to let go and stop constantly worry what is happening to her, be overprotective.
It's about relatives, close surroundings as well as neighbours, etc.
I don't have Neptune in the 3rd but I've had quite a few wounds in that department. Which makes me wonder was it Neptune in her case? Because the mothering is not Neptunian and I usually see by the Moon who is going that way. Mothering is not exclusively related to giving birth to someone. I haven't personally noticed Neptune particularly to require sacrifice, I'd rather say that in its own way Neptune is quite selfish. I've grown up with Piscean people and am still surrounded by such.
All of them got what they wanted and keep doing so. Not in the pushy Marsian way but in a smooth and persistent way. Water against rock, we know who wins.
Do you think one planet in one house can explain her sacrifice? Where is her Moon, what aspects it has, etc. I'd look there. The 5th, the 6th, the 7th. Their rulers and aspects. Neptunians do have a charitable strike but if it goes all the way to sacrifice and especially to mother someone... I'd like to see something more than Neptune in the mix and namely a mothering planet/force as well as rulers of parenting and serving houses afflicted. because she clearly doesn't feel well as a result.
Because if we follow this path, then I should have sacrificed myself for my friends which is not the case. As much as I treasure them, there is only one person for whom I'd go that far and he's my child. And I don't have Neptune in the 5th.
Hm, I actually recalled a very close friend of mine's chart now and yes, I was right, he has Neptune in the 3rd. He has sisters, one of which is quite unhealthy. He's a rich man and supports her treatment. As an older brother, he is also quite used to protect her but I see this in nearly every older brother around me. However, he hasn's stopped travelling or pursuing his career to be next to her although she doesn't have good relationship with the rest of the family and he is her closest person. So, he both satisfies the charitable urge of Neptune and the selfish, me love me best, part is there too... I think he's a good example as his Neptune has no aspects. BTW, he is in a Neptunian profession too, much glamour and art.
spiraling , I critisize what I read in every single astrological cookbook out there without any practical evidence. If it happens to be part of your post, I didn't put it there but I still consider Neptune and all those cookbook keywords lacking proof. real life proof. I'll gladly read your observations and support from charts you've done which fit those keywords. Your own chart has far more than one Neptune in it. And it's not the only one with a prominent Neptune but not all of us are feeling bad because of it. Therefore, it doesn't prove anything yet.