I didn't get diagnosed with dyscalculia and dyslexia until I was 25! (Work paid for a test when I was struggling with basic computations in tax exams).
I am a lawyer now and honestly, my dyslexia does not affect me (although my spatial awareness is very poor and it took me a long time to ride a bike, to tell the time, and I took a long time to learn to drive a car!)
My examiner told me it's very common for state school children to only be diagnosed at university level / beyond (or just never get diagnosed) because as long as they are bright and coping well schools aren't worried and/or wont' get funding.
Anyway you've spotted the issue now and I think she's still quite young. If you can afford a maths tutor (once every two weeks, more before exams) that will help.
Pre-diagnosis the way I got through maths it was just to learn things parrot fashion. I didn't understand why a problem question required me to do A, B, C but I just learned to spot the issue and I did it. To this day, I still don't understand why 1 x 0 is not 0 and I can't deduct (for example) 7 from 41 without first deducting 6 for 40 and then taking off an extra one, but I ended up getting As in my GCSE equivalents and then dropped all the subjects I hated and studied english, arts subjects and music.
Honestly she will be fine. You don't know, maybe if she gets support at school now her spelling might improve. Encourage her to read books, take her to the library, let her choose a new book from Waterstones once a month, read the book then 'watch the movie' etc. And as she gets older it will become clearer where her genuine weaknesses that can't be remediated are, and where her skills are, and you will be able to help her choose further study or career paths accordingly.
Don't write off her academic skills yet (if she gets support she might improve beyond recognition - that's the point of getting her tested!) but if she doesn't she might make a fantastic plumber, electrician, apprentice, wedding photographer, florist, chef, instructor (sports) etc.