Maths was my worst subject . Strange thing is latter on I worked in an industrty where maths was used all the time . Must say it was pretty much the same over & over ., Mainly just looking up tables .

I know we all have them available but how often do we use them. Maybe for complicated maths where multiple multiplications and division but the simple tables and addition and subtraction and the basic percentages are all still done in the head.
About the only time I use them and perhaps 3 or 4 times a year if working out the horrible OHM stuff and I stay away from them as I consider it not needed with what we do.
The electrical police love them as they can banbossal the mere mortals.
On spelling I was a sign writer early on and there were a few sign in town with spelling mistakes BUT I always got the customer to check before I started.
I remember one very complex many coloured reverse full office window (you start at the end (shadows, outlines, scrolls etc, and work to the start, the background of the whole job and all the letters etc are backwards, and this was all hand written and way before vinyl cutting) and when I finished I notice one letter was back to front.
The owner (could not see it) but thought it was great and said if anyone noticed he would give them a discount and I don't think any one did. I would have had to remove the whole job to fix one letter.
One of my biggest fights was with a maths teacher as he could not do the maths in his head himself as I tested him in front of his class, (was not appreciated either but I had him on a spot and he had no choice as refusal was instant admission that he did not have the skills). My son with only a few days tuition was able to beat him to the punch as well as got more correct than the teacher.
As every thing time marches on and there are good and bad at all but I really feel the the government of today are letting not only our children down but our teachers as there is not the training available and teachers can no longer get respect and I know several who just gave up and went out into the normal work force.
It takes a special person to be a good teacher in any field. You have to know your job very well, but also you have to be able to not only encourage your students but gain their respect and these two last points are very hard to get now days.
Any one who stayed teaching for 40 years was either very good or very dedicated and had a very hard skin so I take my hat of to you sticking it out. If you enjoyed your time teaching then all the better.
The happiest years I had working was installing software in large factories and training the staff and then supporting the admin once I had finished the job and left the plant either to return to the office or on to the next job. Each install took about 6 weeks 7 days a week 20 hours a day so not the normal job.

My son was also Dyslexic and the school did not say or do anything. Just said he was dumb, dont worry about it.
Jules have they tried the colored lenses trick yet.
My son jumped about 4 years in a few seconds, again the school would not let him wear them in class. was not popular when I suggested the teacher and the other students should not wear their glasses as well.
We went through SPELD here in SA but should have something similar where you are. www.speld-sa.org.au/
Perhaps give them a ring and ask if there is anyway they can help you and mention the colored lenses.
Try and get as many different colored sheets and put them over a book and get her to try and read through it. Keep trying different colours till you find the one.
Once you get a colour, my sons was blue and why we had problems with school as they looked the same as sun glasses but some need yellow and others pink etc so just try as many as you can.
If you go into a newsagent and tell them what you are trying to do and they may let you do the test in their shop.