Name for a baby who passed away.

That's so heavy to hear
First of all, I want to wish you both lots of strength and try to enjoy her as long as possible. Try to build lots of memories, for example in the form of photos.

And as for the name, I think Angel is very beautiful. Other names that come to mind are: Sky, Rosangel, Angelina... I find it hard to say.

First off; what a heavy thing to say! A terrible message to receive. I hope you can still enjoy your little girl for a very long time. Strength

Then about the name, I understand what you mean. It's indeed difficult to come up with one. I'll try a few;
Valerie - meaning strong and brave
Avalon/Minou - meaning bird, strong
Iva - meaning miracle
Aurora - meaning 'the break of day'
Perhaps also (I think nature names fit well here): Butterfly Blossom Flower Bloom Daisy Myrtle Blackberry Spring Dille Fleur Flora
And maybe Sky/Skylar/Skyler

Once again, strength and enjoy each other

Oh gosh, that's so sad. I wish you both lots of love and strength in the coming time!

It's hard to come up with such a name, but I think it's a really beautiful idea. Maybe Stella, Seren or Estelle instead of Sterre? They both also mean 'star'. Or Luna or Selena ('moon' or maybe Mare or Mara ('sea'.

Or a name like Joy, Grace, Hope or Faith?

Freia/Freya/Freja also has a beautiful meaning and might be fitting in your case. It means 'lady/goddess of love, beauty and death'. But I can also imagine that you find that too direct/literal.

Some other names with beautiful meanings: Celeste (heavenly), Belle (beautiful), Lieve (beloved)

Yes, it's really nice to do. I named my baby Jacy because of the meaning (the healer). I'll think again about a nice name. Wishing you lots of strength with everything.

As a first, I want to wish you strength for the coming time. There are no words for what you're going through right now. Choosing a name in this situation, and with the meaning you're looking for, isn't easy, but it is important. I did a little search online and here's what I found. Maybe there's something in there that you also find beautiful, or it might guide you in the right direction for your search.
Amarens -> immortal love (Frisian)
Kalina -> to love (Aboriginal)
Jedidja -> beloved of the Lord (Biblical)
Nayley -> I love you (Zapotec)
Aiko -> born of love (Japanese)
Ava -> desired (Germanic)
Liora -> my light (Hebrew)
Ziva -> light of God (Hebrew)