Transitioning from hybrid to road/cyclocross

[Lady Hamilton]

Dear ladies!
Five years ago you were invaluable in choosing my dear Specialized Vita.
Now with kids a bit older and with more time on hands, I am looking at getting a more ambitious bicycle. What I have not yet decided is whether I want an endurance road or a cyclocross...
I am not looking at becoming this amazing racer, but I do want to start going on longer rides. Last year I have done two charity rides: 30 and 40 km each and I enjoyed it. I ride on mixed trails a lot, and I commute to work (also mixed surface, although mostly tarmac). I love my Vita, but it does struggle on some gravel paths.
I am 5 foot 1 and 100 pounds, which makes everything more difficult than I have anticipated, especially when it comes to cyclocross bikes. I have tried a unisex Cannondale CAADX 2017 in size 44 and I am not clearing the standover at all... which is surprising, because I have tried Specialized Ruby, and 44 was really tight. I have 70 cm inseam.
Is there a cyclocross bicycle for a petite girl that does not weigh a ton? Vita is around 24-25 pounds and it seems to me silly to buy something that weights the same or more.
Any input is highly appreciated.