Well there is a known tendency toward co-morbidity of ADHD with other issues (dyslexia, other specific LDs and tourettes being things that immediately come to mind). So yes there IS a known connection.
Is your daughter taking medication for her ADHD? Medication had a profound impact on my DDs ability to read (she does not have dyslexia, she's just much more able to do the work, any work, on medication), even more so on her handwriting and I think on her eye tracking (she has age appropriate eye teaming & tracking but a DYS FSIQ, the behavioural optometrist didn't want to address the issue because she met age norms but did acknowledge that there was a massive gap between her ability to read mentally and what her eyes could manage). She also has glasses for her eye teaming/tracking issues so it's hard to say for sure if the glasses or the meds help the eye issues the most, but even with glasses and meds she really needs books with a larger size font, good quality font, well laid out text and lower density text than what generally comes in books at her reading level.
