I would say that yes, it’s likely normal considering you pointed out that even though she is fluent in English, she isn’t well written. Perhaps she realizes this about herself and texting is a source of insecurity for her. If that is the case, I can assure you that she is spending more time analyzing her OWN behavior and response than she is thinking about how much time has passed since she responded. Secondly, how do you handle it? You don’t. Be patient with her. She’ll respond when she can. If you feel texting is really getting in the way of healthy communication, you do have her phone number and she indeed has a phone – pick it up and call her. A lot easier and much less confusing for everyone involved.
I say loosely followed here because you don’t want to always text her eleven minutes after she texts you if she usually takes about ten minutes to text you. If you develop a pattern of taking the same amount of time to text her every time you respond back, she’ll pick up on this and know that you are literally just waiting to text her. It’s nearly as bad as texting her right away.

Timing matters a lot, when you are trying to seduce a married woman with text messages. If you are aware of her routine and know she checks her phone in the night, text her during that time. The chances of getting a reply are also high if she has free time on her hand, and you may as well build up a conversation with her. If she is busy in the morning and you text her, she may dismiss it as annoying. So, time your texts and the replies to her text smartly, in order to make a lasting impact on her mind.

Flirting to some is almost like an art! No matter how hard some people try, they really can't flirt for nuts whereas for some, it's really natural and comes with ease! For those too chicken to flirt openly, text messages are a great way to ask someone out for a date and get the message across without really worrying about being insulted! Therefore, I have a compilation of some flirty text messages you can use to impress that special someone. This SMS collection would surely inspire you to write your own poetic verses!