Would you do this as a seller or am I in the wrong as buyer here?

So I was in a live show and I bought 6 items . After the sixth item the seller said my card didn’t go thru for the last two items . My payment method - is my debit card which is my credit union . They often deny sales when they are multiple small amounts like in a posh show, being debited and then text and call me . I realized they had texted me . So I said I would fix it , log off , and come right back to the show . That I needed like 10 mins . My dog needed to go out anyway . I was like 10-15 minutes tops and when I came back she had ended the show . So I had 4 items paid for . And 2 I wanted to add . She said she couldn’t add them without charging me the extra shipping (an additional $6.95) and asked if I could cancel the 4 previous sales and we could do a new bundle bc she couldn’t / she said she had cancelled too many sales based on buyers requests and PM put her on some type of probation and that she wasn’t allowed to cancel anymore sales . I said I had no problem cancelling the sale and please don’t ship yet so I could make a new bundle . She said sure . And this was the same night . I searched posh and couldn’t find a way to cancel a live show purchase . I said I would request posh to cancel the sale and could she please not mail my items until they responded because I really wanted to buy the other two items and REALLY didn’t want to put out another $6.95 for shipping . She didn’t respond at that point but it was getting late at night so I figured she went to bed and disconnected from her phone . We were having our conversation under the purchase bundle already made. So I invited Poshmark to the conversation and explained what happened and requested they cancel the purchase . I woke up the next day and Poshmark had responded first with an automated response about live show purchases being final . But then a real person from Poshmark responded and said they would have happily cancelled the sale so I could make the larger purchase with one shipping charge but the seller had already shipped the other items . This was at like 10am the next morning . I can’t understand why the seller did this ? I told her I was in no rush to receive the items prior and didn’t mind waiting a few days before she shipped again while we worked this out to save on shipping . Initially she said she understood and wouldn’t ship yet until she stopped responding and then just shipped before Poshmark even could respond . Am I wrong for being a little confused and annoyed?