She wants to continue the 'princess' story but she just misstyped 'help' and put 'helo'.
Where you go from here depends on how direct you want to be. For example you could say:
"Well now i have rescued my princess, i need to get you safely tucked up back at my castle, it's a long a dangerous journey but we can be there by morning. Do you have the stamina to ride all night?"
Now, she can either get the jist, and reply in kind, be put off and not reply again, or be put and reply saying something like "Sex, is that what you think you are gonna get from me?!"
If that happens then you still have a get out by saying something like "What? OMG haha thats not what i meant! Clean your mind up!

"