Worried I've scared off colleague 15 years younger

Dear Coleen
Her divorce came through in January, which she told me she was relieved about, but their five-year-old daughter is struggling apparently, so things are still challenging.
In the past we've been out for a drink after work with colleagues, as well as a couple of times on our own. We get on very well and I'm also divorced, so we have that in common.
However, the last time we got talking, I admitted my age and she seemed taken aback. I'm assuming she thought I was younger, as people often tell me I look a lot younger than 53.
Since then, she's been a bit cool with me at work and, when I've suggested a drink, she's made excuses, usually to do with getting home for her daughter. I've realised how much I like her but I'm now worried my age is an issue.
The other night, after a few beers, I messaged her to invite her for lunch and also suggested it might be nice to go away together for a night.
Straight away I regretted it, as it seemed quite forward, especially as there's been no romance between us.
It's been four days and she still hasn't replied and she's clearly avoiding me at work.
What do I do now? Do you think the age gap is a problem and can I rescue the situation?
Coleen says
I THINK you probably need to back off a bit. As you say, it's not clear if she has any romantic feelings for you, so it feels li...