I would go for the work and text her about going out just the two of you after that's done. You could even tell her face to face, after you finish the work; you're more likely to get a straight answer that way as well, or at least be better able to gauge her reaction in person.
The last thing I can say about texting and e-communication (as has been said many times before) is really to keep it to an absolute minimum. I barely go more than 5-10 messages between dates (and often not even that much), never really engage in e-conversation, and rarely directly answer questions when asked. The phone/email/messenger is for setting dates.
Example conversation from date at weekend. This girl had previously text me about any new jobs I had coming up 'that she should know about'. I completely ignored the question on the text.
During the date....
TMK: 'I have been offered two jobs and have another interview next week. So I'm waiting to make a decision.'
GIRL: 'OMG. Why did I not know about this??'
TMK: 'Well, I'm telling you now aren't I...?
'
The result of this is threefold. I have given us something to talk about when face to face; I have maintained mystery and enabled her wonderment about me when absent; I have forced her to qualify her interest in my personal situation.
Electronic communication should only ever facilitate face to face communication. Face to face communication is the only communication that truly facilitates seduction.
The only time I increase electronic communication briefly is if I know that a face to face is not on the cards for a week or two. Even then it's only a brief check in once or twice a week.