It depends on what your interaction with her has been like so far.
If she has flirted with you somewhat frequently in the past and now you have noticed that she is being bossy over text, she may be playing hard to get to an extent.
In a scenario like this she may feel that she has been making it too obvious that she likes you and that it is time to start making you doubt her intentions.
On the other hand, if she has done nothing in the past to show you that she likes you, such as flirting with you or always asking you questions about yourself, she may not be playing hard to get at all.
She may simply be bossy over text because this is her natural disposition.