How do I deal with a school mum who's hot for hubby?

A year and a half ago, my husband, our son, and I moved to a new area where I befriended a mother at our son's new school. I can't say we're good friends, but her kid is my kid's BF and I have done a lot of favours like babysitting, taking her kid at short notice, etc. In the past year, she's made it very clear to me that she fancies my husband (but in a non-threatening way). Comments like, "He's gorgeous. If you don't want him, send him my way" or "I want your man!" giggle giggle, I'm your harmless girlfriend and I don't mean it. That kind of thing. None of it bothered me because I thought, she's 10 years older than me, single mum, she needs the attention and fancies my hubby. But she's not blatantly hitting on him and I totally feel secure with husband. Call me a fool but hey, I trust him. What I don't like is her popping by, asking my son to get dad- not me, no mention of me. She texts hubby, sometimes emails him. Benign stuff, but still a bit of banter about our kids and chit chat. He has recently let her know that it's best if she contacts me regarding school/kid matters. So now her texts to him are less frequent but there's more 'spiritual' stuff, well-being and positive vibes, signed with xxx. It's not OTT, but it's not so cool either. We don't hang out with her really because to be honest, she's a nice lady, but she hijacks my husband and and definitely flirts with him. It's awkward and other people who have witnessed it have raised a mild alarm. A couple of weeks ago, after seeing hubby and I at the school gates (it's normally just me, but hubby got off early from work) she sent me a text after I got home reading "Why did you disappear, I wanted to flirt with your gorgeous husband?!" My first thought was"Lady did you have a tipple before you picked up your kiddie from school?" I thought it was OTT and it made me uncomfortable. I also find it weird that she's so blatant to me about her attraction for my hubby. Any insight or advice? Thanks.