If you're going to let the brush touch her skin at all, https://www.amazon.com/WAHL-Premium-Dual-Level-Slicker/dp/B079TB5SVK is the gentlest slicker I've found. The long pins are coated and smooth so it doesn't scratch at all. I use that one primarily when my boy's coat is very short. When it's longer I have to part the hair and line brush, so the brush isn't scraping his skin regardless.