Prince of Macedon
Attack is best defence
You can see that Greek_Princess is an aggressive player and this has several advantages:
She can force you to respond to herand not the other way around.
She can attack when she is ready.
The enemy player is more likely to isolate their own cavalry, making it easier for Greek_Princess companions to crash in the enemy cavalry from all sides making them rout and massacre the enemy cav.
Counter messure
How do you counter this tactic?
Maybe you should have more upgrades on your own cavalry and keeping them close to your infantry I suggest attack and experience upgrades.
While only upgrading gold defence for the infantry.
But it really depends on what factions to bring every faction in rome total war has diffrent strengths.
Dont have the infantry units deployed side by side since that benifits phalanx units not cohorts.
Launch your own offensive and if your roman throw pila and then form testudo in guard mode and then march right through those spears.
Then the swordfighting skills of the roman infantry can be decisive as long as the cohorts aren't deployed side by side!
The cav fight is most important use some cohort support and dont forget to micro manage your cav.
The best faction to use against Greek at this level is probably the Selucid Empire. Greek Cavalry cannot fight against cataphracts in a melee so it is a good idea to take a couple gold. Another effective use is that of what |TAoW|Ahille used. A skirmish army can be devestating against the Greeks.