@quirkychick I'm sorry for what you're going through, that sounds really hard. You are still a mother and I'm glad your daughter is settled at least - you're probably feeling scattered now because you've had to hold your breath and keep everything in until the crisis was over. Hopefully you'll find something meaningful on this thread 
@Nosignalnorelationship that's completely normal to struggle to articulate your beliefs at first! I think you're definitely on the right track with spending time in nature, it's so grounding. Perhaps you could visit some of the Icelandic landscape you felt so connected to in meditation? You could create a mental happy place or calm place from that landscape which you can visit when you need to quiet your mind? It doesn't have to be a real place, it could just be inspired by what you saw there.
You could try reading some of the Irish myths to get a sense of connectedness to your heritage and the beliefs of your ancestors. I really recommend the delightful Anthony Murphy of Mythical Ireland, I've been a fan of his for years and he has over 100 videos on YouTube from when he held daily live streams of reading Irish myths during the pandemic, which I found so valuable during that time. He's also an author, but those YouTube videos are so cosy and welcoming, they're a bit of a comfort blanket for me and you might find that too.
I also have Irish heritage but a bit more removed than you, and the Celtic side of things is really integral to my own practice. One of my patron Gods is Celtic and I went on a pilgrimage to some of his sacred sites just last week! If you're drawn to any of the Celtic Gods, there's no harm in praying or meditating on that, or even lighting a candle to one of them as an offering and stating that you're open to their guidance. I've also been working with trees a lot recently using the Celtic tree zodiac inspired by the Ogham alphabet, and I've found that very grounding, so you might be able to bring that in.
Slightly adjacent to what you've mentioned your beliefs are, but I also do a lot of angel work, and I find the angels to be such powerful healers and comforters, especially during the darkest times. BlankTimes is absolutely correct in saying that the grieving process can't be rushed and is very individual, so you do need to give yourself time, but when I have felt like I was drowning in emotion and even experiencing physical symptoms from emotional pain, I have been offered such relief from asking angels for help. Archangel Michael is a protector, Archangel Raphael is a healer (especially for physical issues), Archangel Jophiel helps us to find joy and Archangel Azrael helps guide us through grief, loss and transitions in life.
I completely understand the urge to turn to a tarot reader for some guidance, but as someone who is experienced in that area I would urge you to seek out someone trustworthy who has genuine word-of-mouth testimonials, not just someone from a generic psychic website or chat line. If you know anyone who has had their cards read, ask them if there's a reader they trust and would recommend - the last thing you need at this point is to end up more confused or upset when you're feeling vulnerable 