I personally hate workbooks.Most are dreadful quality,the wrong font and sooooo dry I'm amazed they don't put most kids off for life.
Obviously you teaching her formation would be better but make sure you are teaching them exactly right as she'll have to relearn later for joins.
I personally don't have a problem with dotty writing if it isn't the only method. Some children need a lot of practise with handwriting and I think dotty writing can help as mundane as it is continuously going over a letter you've been taught how to form correctly can help.
My ds had dreadful handwriting,could form them all beautifully but his handwriting was very untidy.The continual repetition did help him.Putting a black dot where the correct places are to start is good. I bought the font his school uses for £5 and it helped enormously,I did do proper formation sessions with him too though. The dots were only to reinforce.
That link you liked didn't look like the correct font most schools use to me,don't know if there was a choice.
I don't know how old your dd is and paint,chalk,sand are fantastic but for older children that have learnt the correct formation I do think there is a place for boring old repetitive hand writing practise. YOu get in a rhythm and the letters become 2nd nature.