As you work for free (for her) in order to improve your knowledge and skills, she should really value your work, because it saves her a lot of money. I would. But we (you and us) don't know if she does.
If she doesn't undertsand how big a value your work adds to her business, you're left with 2 choices :
stand-by / let it go, and (maybe) wait for her to answer. At that time, if you're still in the mood of ending the job, you can carry on, or find any good excuse to stop working for/with her.
end the job just to get another valuable line on your resume. But, until you get an answer, you're stuck in a dead-end and no possible U-turn.
At the moment, it seems like you're still in between the two options, and want to give it another (last?) try. So, if it was me dealing with this, I'd rather check a couple of things first because I decide which action to take. Because, working with an online booking, with confirmation via email/text, I often see that people:
- didn't get the confirmation/reminder on time or at all (happened roughly like 2% to 5% of the time).
- didn't see they had received it:
- -> they don't check their emails because they don't use it / don't care at all (!)
- -> they check their emails, but never the trash/spam folders (and it happened many many many times that the "proof" was in there...)
I see only one way to check, and get a better idea about wether she cares or not about your efforts and the time you put in, and you'll have to nudge anyway.
Email isn't an option, so you're left with "in person" or "text". The latter has a valuable advantage over the former, it helps you keep track and prove later, if needed, and if she doesn't answer, than you cared, and you were professional. In either case, don't blame her, be professional, straight to the point, and nice. Let her know that, without any answer/help/support from her, you won't be able to finish the job.
I would phrase it like this, with some slight adjustments, wether you decide to text or tell her directly:
Hi Alice, I sent you an email with important update. Without any feedback from you, I'm stuck, and can't move forward. Could you please let me know, when you get a chance to check it out? Thanks.
She may tell you she didn't receive the email, or just missed it and apologize, or just didn't have time... But you'll have done what was necessary. And no answer from her IS an answer anyway ;)