I don't think there is cheating involved. On some occasions, Cpt. Anne O'Malley sends units. One such occasion is when an inactive player returns to the game. Now, Sue doesn't have a bubble, so she wasn't away for very long (I don't know how long for a bubble, but I think it's between 2 weeks and a month). However, she may have been away for a while and then return.
I see that she has active prestige, which could be from levelling up on prestige, which might be related to these reinforcements, or those may have come from completing one of many quests that the game puts on us.
Since you're blocking her again, check the Garrisons tab. It'll tell you when was she last active, and I expect (if you check today) that it'll be "today" or "yesterday".
Long story short: she likely finished some quest or got those reinfs for being away for a while (but not long enough for a bubble).